CIÊNCIAS
8ª SÉRIE
CEESVO
CIÊNCIAS INSTRUÇÕES PARA O ESTUDO Para estudar e aprender o conteúdo do módulo, você deverá ler atentamente as explicações. Talvez seja necessário ler mais de uma vez. Veja as instruções contidas nas atividades e somente comece a resolver os exercícios após ter entendido completamente o texto. Não escreva no módulo, pois você terá de devolvê-lo ao CEESVO para que ele seja utilizado por outra pessoa. Consulte o professor se você encontrar dificuldades durante os estudos. ROTEIRO DE CIÊNCIAS – ENSINO FUNDAMENTAL 5ª SÉRIE: Módulos 1, 2 e 3. 3. 6ª SÉRIE: Módulos 4 e 5. 7ª SÉRIE: Módulos 6 e 7. 8ª SÉRIE: Módulos 8 e 9
Bom Estudo!
1
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CIÊNCIAS
8ª SÉRIE
CEESVO
8ª SÉRIE MÓDULO 8 SEXUALIDADE E REPRODUÇÃO HUMANA O INSTANTE DA FECUNDAÇÃO
Encontro dos gametas
Fecundação artificial
A reprodução em todos os seres vivos possui a função de perpetuação da espécie. A nossa espécie começa com a fertilização do óvulo, ou seja, a união do núcleo do gameta masculino, o espermatozóide, e o núcleo do gameta feminino, o óvulo. Gâmetas: células sexuais. Os gâmetas são produzidos nas gônadas. No homem, os testículos e na mulher, os ovários.
Espermatozóide
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CIÊNCIAS
8ª SÉRIE
CEESVO
PUBERDADE Fase na qual as glândulas sexuais (gônadas) são estimuladas pela Glândula Hipófise para “agir” mais ativamente. Nesta fase, sob a ação de hormônios, o corpo do (a) adolescente começa a sofrer mudanças. Observe o quadro abaixo:
MUDANÇAS QUE OCORREM NA PUBERDADE NOS MENINOS
NAS MENINAS
Os pêlos faciais e corporais aumentam. O corpo fica mais musculoso e os ombros tornam-se mais largos. A laringe aumenta rapidamente de tamanho, tornando a voz mais grossa.
Os seios desenvolvem-se. A camada de gordura existente embaixo da pele aumenta, o que deixa os contornos do corpo mais arredondados. Os quadris alargam-se.
EM AMBOS
rapidamente ("estirão da puberdade"). A estatura e a massa corporal aumentam rapidamente Os órgãos genitais aumentam de tamanho. A pele que recobre esses órgãos fica mais escura. Aparecem pêlos embaixo do braço e na região púbica. Os testículos dos meninos e os ovários das meninas intensificam a produção de hormônios sexuais. Os testículos dos meninos iniciam a produção de espermatozóides- o menino ejacula pela primeira vez. Os ovários das meninas começam a produzir óvulos maduros - a menina ovula pela primeira vez. Ocorre a primeira menstruação ou menarca.
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CIÊNCIAS
8ª SÉRIE
CEESVO
SISTEMA REPRODUTOR FEMININO É formado pelos seguintes órgãos: ovários (2), tubas uterinas (2), útero (1) e vagina, e outra parte externa , a vulva. tuba uterina .
OVÁRIOS E TUBAS UTERINAS Quando a mulher nasce já possui todas as células que irão dar origem aos óvulos, denominadas folículos (+/(+/- 500.000). Destas 500.000, apenas 500 irão se transformar em óvulos "maduros". Durante a fase da puberdade, as gônadas femininas (ovários) iniciam a produção dos hormônios: estrógêno e progesterona, os quais irão estimular o amadurecimento dos folículos. Após a liberação destes hormônios, a cada 28 dias, mais ou menos, um óvulo é liberado do ovário.Processo denominado ovulação. tuba uterina /
ovulação
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CIÊNCIAS
8ª SÉRIE
CEESVO
Tubas Uterinas: Local da fecundação. Útero: Abriga o feto. O útero é formado interiormente por um tecido denomi nado endométrio, que a cada mês vai se espessando, se não houver fecundação, o endométrio desprende-se do útero e é eliminado pela vagina. Este processo é denominado menstruação Vagina: DilataDilata-se para a cópula e para o parto. Vulva: Parte externa e visível dos órgãos genitais. ternos. Representação dos órgãos genitais genitais ex ex ternos.
1 - clitóris clitóris 2 - grandes lábios 3 - pequenos lábios 4 - orifício vaginal 5 - ânus
EXERCÍCIOS – Responda em seu caderno: 1. Quais são as estruturas que formam o sistema reprodutor feminino? 2. Durante a gravidez, em que órgão do sistema reprodutor feminino ocorrerá o desenvolvimento do embrião? 3. Como são chamados os hormônios h ormônios sexuais femininos femininos produzidos nos ovários? 4. O óvulo, célula reprodutiva feminina, é formado no interior: a) do útero. b) da próstata. c) do ovário. d) do epidídimo. feminino o óvulo é fecundado? 5. Em que região do sistema reprodutor feminino a) ovário.
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CIÊNCIAS
8ª SÉRIE
O CÂNCER DE MAMA PODE SER EVITADO COM APENAS UM
TOQUE. PREVINIR É O MELHOR REMÉDIO.
CEESVO
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CIÊNCIAS
8ª SÉRIE
CEESVO
MENSTRUAÇÃO Na maioria das mulheres, o ciclo menstrual tem em média 28 dias, porém ciclos de 21 a 35 também são normais. normais. O sangramento menstrual dura, dependendo da mulher, cinco dias. Ao longo de cada ciclo menstrual, um ou mais óvulos amadurecem e são liberados para posterior fecundação (ovulação) e, em um ciclo de 28 dias, a ovulação ocorre aproximadamente no 14.° dia antes da menstruação, ou seja, 14.° dia do ciclo. ciclo . No caso de um ciclo de 30 dias, a ovulação ocorre no 16.° dia do ciclo ci clo..
A. Nos primeiros dias do ciclo menstrual, uma parte do endométrio é expelida pelo útero: é
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CIÊNCIAS
8ª SÉRIE
CEESVO
SISTEMA REPRODUTOR MASCULINO
É formado pelos pe los testículos, pelos epidídimos, pelo pênis, pela glândula próstata, pelas vesículas seminais e por canais que levam os espermatozóides dos testículos até o pênis para posterior ejaculação. Os testículos são glândulas sexuais que produzem os espermatozóides (gametas) e o hormônio testosterona. A cada dia são produzidos +/- 200 milhões de espermatozóides, os quais amadurecem nos epidídimos. Os espermatozóides saem dos epidídimos pelos canais deferentes, recebendo um líquido energético composto por carboidratos e vitaminas produzidos pelas vesículas seminais. Após receberem esse líquido, atravessam pela próstata, a qual produz um líquido incolor e viscoso.
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CIÊNCIAS
8ª SÉRIE
CEESVO
EXERCÍCIOS – Responda em seu caderno: 7.O que é reprodução e qual a sua importância para os seres vivos? 8. Qual a função do epidídimo? 9. Do que é formado o sêmem? 10. Quais são as funções da uretra? 11. O que são células de Leydig? Assinale a alternativa correta nos exercícios abaixo: 12. 12. Nos seres humanos, os espermatozóides são produzidos em estruturas denominadas: denominadas: a) próstata. b) bexiga. c) ovário. d) testículos. 13. Como é chamada a glândula que ocorre apenas no homem com a função de produzir um líquido leitoso e alcalino que promove o aumento da mobilidade e dafertilidade da fertilidade dos espermatozóides: a) vesícula seminal. b) próstata. c) canal deferente. d) ovário.
14. Canal que é cortado na vasectomia: a) Uretral. b) Seminífero. c) Ejaculador. d) Deferente. 15. Glândula que produz líquido nutritivo para os esper matozóides: Próstata. a) Próstata.
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CIÊNCIAS
8ª SÉRIE
CEESVO
MÉTODOS ANTICONCEPCIONAIS tipo s: São medicamentos ou técnicas que impedem a fecundação. Existem diferentes tipos:
Pílula Anticoncepcional Anticoncepcional Deve ser indicada pelo Ginecologista. É elaborada a base de hormônios que impedem a ovulação. Normalmente Normalmente é tomada por um período de 21 dias consecutivos, iniciando -se no 5.° dia da menstruação (5.° dia do ciclo). Segue-se 7 dias de descanso, período que ocorre uma nova menstruação e iniciainicia -se nova cartel cartela.
Lembre-se: tomá -la, além de seus riscos A única forma de uma mulher saber a melhor pílula e o método de tomáe sua eficácia é através de seu ginecologista de confiança.
Preservativo Conhecida como Camisinha ou Condom. A matéria- prima utilizada para a sua fabricação é a borracha (látex) e possui como função reter o esperma no seu interior. São eficazes na prevenção das DSTs. Camisa de Vénus (látex).
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CIÊNCIAS
8ª SÉRIE
CEESVO
Dispositivo intra-uterino (DIU) É um dispositivo metálico ou plástico que apenas o ginecologista ginecologista pode colocar colocar no interior interior do útero. O DIU impede que o ovo realize nidação (fixação do ovo na parede uterina).
Modelos de DIU DIU inserido no útero
Tabelinha Cuidado, pois possui uma margem de de erro de +/- 40%. Baseia-se Baseia -se em identificar o período fértil da mulher e evitar relações sexuais nesse período.
Coito interrompido Consiste em não n ão ejacular na vagina (pouquíssimo confiável).
Esterilização Método cirúrgico que ao ser realizado torna o homem ou a mulher estéreis.
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CIÊNCIAS
8ª SÉRIE
CEESVO
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CIÊNCIAS
8ª SÉRIE
CEESVO
Leituras Complementares
A PÍLULA, A HIPÓFISE E A PREVENÇÃO DA GRAVIDEZ O aumento do nível de estrógeno no sangue tem efeito recíproco sobre a hipófise, pois diminui a produção de FSH. Entra em ação, aí, o LH, que vai determinar a liberação do óvulo. Depois que o óvulo é liberado, o corpo lúteo se forma por ação do LTH. (Hormônio luteotrófico). (É a secreção deste último hormônio hipofisário que influi sobre a produção de progesterona pelo corpo lúteo). À medida que aumenta seu tamanho, o corpo lúteo libera mais progesterona, que vai inibir, temporariamente, a liberação de outros óvulos; isso afasta o risco de ocorrer nova gravidez antes de ser resolvido o destino do óvulo liberado. Por assim dizer, a
um a cada mês. A progesterona detém o processo proces so por ação indireta: retroage sobre a hipófise e inibe a produção de FSH, o hormônio que mantém a "fila" de óvulos em movimento. A maturação permanece interrompida até que, caso não ocorra fecundação do óvulo libe rado, os preparativos do útero se desfazem e a mucosa se desprende, no processo eliminatório da menstruação. Ao tomar a pílula, a mulher "engana" a hipófise. Com estrógeno e progesterona em altos níveis de sangue, a hipófise interrompe a secreção de gonadotrofinas. Sem o estímulo desses hormônios hipofisários, por sua vez, os ovários suspendem sua secreção normal. no rmal. Com ovários e hipófise nessa inatividade,
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CIÊNCIAS
8ª SÉRIE
CEESVO
MÓDULO 9 DOENÇAS SEXUALMENTE TRANSMISSÍVEIS (DSTs) Os órgãos em estado normal (sadio), não possuem odor. Qualquer alteração na genitália deve-se deve-se procurar assistência médica, pois essas alterações podem ser indicativos de DSTs (Doenças (Doenças Sexualmente Transmissíveis) e seus principais sintomas são: coceiras; mal cheiro; secreções; feridas; baixa resistência.
AIDS Conceito
Síndrome (uma variedade de sintomas e manifestações) causada pela infecção crónica do organismo humano pelo vírus HIV (Human Immunodeficiency Vírus). O vírus compromete o funcionamento do sistema imunológico humano, impedindo-o de executar sua tarefa adequadamente, que é a de protegê-lo contra as agressões externas (por bactérias, outros vírus, parasitas e mesmo por células cancerígenas). Com a progressiva lesão do sistema imunológico, o organismo humano torna-se cada vez mais susceptível a determinadas infecções e tumores, conhecidas como oportunistas, que acabam por levar o doente à morte.
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CIÊNCIAS
8ª SÉRIE
CEESVO
Prevenção
Na transmissão sexual se recomenda sexo seguro (abstinência, relação monogâmica com parceiro HIV negativo, uso de camisinha). Na transmissão pelo sangue recomendarecomenda-se cuidado no manejo de sangue (uso de seringas descartáveis, exigir que todo sangue a ser transfundido seja previamente testado para a presença do HIV, uso de luvas quando estiver manipulando feridas ou líquidos potencialmente contaminados). Não há, no momento, vac ina efetiva para a prevenção da infecção pelo HIV. Leitura Complementar VÍRUS DA AIDS DESAFIA O COQUETEL Êta vírus tinhoso! Enquanto médicos e pacientes comemoram os resultados dos novos coquetéis de drogas contra o HIV, que cortaram pela metade o número anual de mortes por Aids, cientistas revelam que os tratamentos têm uma eficiência menor do que a imaginada. É o que mostra um estudo divulgado por uma das revistas médicas mais importantes i mportantes dos EUA, a New England Journal of Medicine. Os pesquisadores descobriram que peq uenas uenas quantidades de HIV podem ficar escondi das nos glóbulos brancos - as células de defesa do organismo - mesmo em pacientes que aparentemente ficaram livres dos vírus da Aids graças aos coquetéis de remédios. Para chegar a essa conclusão, eles trataram oito pacientes com combinações de medicamentos antivirais por pelo menos dois anos. À primeira vista, todos os vírus da Aids tinham sido erradicados. Mas, numa observação mais acurada, os pesquisadores constataram a existência de vírus, em estado latente, num certo tipo de glóbulos brancos - os linfócitos CD4 - que têm um tempo de vida maior do que o da maioria das células do sistema imunológico. "Poderão ser necessários muitos anos de tratamento com os coquetéis de remédios para
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CIÊNCIAS
8ª SÉRIE
CEESVO
CANCRO CA NCRO DURO (SÍFILIS)
Conceito
Doença infecto-contagiosa sistêmica (acomete todo o organismo), que evolui de for ma crónica (lenta) e que têm períodos de acutização e períodos de latência. Pode com prometer múltiplos órgãos (pele, olhos, ossos, sistema cardiovascular, sistema nervoso). De acordo com algumas características de sua evolução, a sífilis divide-se em Primária, Secundária, Latente e Terciária. Quando transmitida da mãe para o feto, é chamada de Sífilis Congénita. O importante a ser considerado aqui é a sua lesão primária, também chamada de cancro de inoculação (cancro duro), que é a porta de entrada do agente no organismo do paciente. Trata-se Trata-se de uma lesão ulcerada (cancro) não dolorosa (ou pouco dolorosa), em geral única, com a base endurecida, lisa, brilhante, com presença de secreção serosa (líquida,
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CIÊNCIAS
CANCRO MOLE
Conceito
8ª SÉRIE
CEESVO
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CIÊNCIAS
8ª SÉRIE
CEESVO
CONDILOMA ACUMINADO (HPV) Conceito
Infecção Infecção causada por um grupo de vírus (HPV - Human Papilloma Viruses) que determinam lesões papilares, as quais, ao se fundirem, formam massas vegetantes com o aspecto de couve-flor. Os locais mais comuns do aparecimento destas lesões são a glande, o prepúcio e o meato uretral no homem e a vulva, o ú tero na mulher. Em ambos os sexos, períneo, a vagina e o colo do útero pode ocorrer no ânus e reto, não necessariamente relacio nado com o coito anal. Com alguma frequência, a lesão é pequena, de difícil visualização à vis ta desarmada. ônimos imos n Sin ô
Jacaré, jacaré de crista, crista de galo, verruga genital.
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CIÊNCIAS
GONORRÉIA
8ª SÉRIE
CEESVO
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CIÊNCIAS
8ª SÉRIE
CEESVO
GRANULOMA INGUINAL
Conceito
Doença bacteriana de evolução crónica que se caracteriza pelo aparecimento de le sões
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CIÊNCIAS
8ª SÉRIE
CEESVO
HEPATITE B Fígado com hepatite virótica aguda na sua forma fulminante.
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CIÊNCIAS
8ª SÉRIE
HERPES SIMPLES GENITAL
CEESVO
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CIÊNCIAS
INFECÇÃO POR CLAMÍDIA
8ª SÉRIE
CEESVO
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CIÊNCIAS
8ª SÉRIE
INFECÇÃO POR UREAPLASMA
CEESVO
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CIÊNCIAS
8ª SÉRIE
LINFOGRANULOMA VENÉREO
CEESVO
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CIÊNCIAS
8ª SÉRIE
INFECÇÃO POR TRICHOMONAS
CEESVO
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