10. The hormones that have the most effect on CNS development and on secondary s
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10. The hormones that have the most effect on CNS development and on secondary sex characteristics in female are the A) Androgens B) Prolactins C) Estrogens D) Oxytocin Defaul Font 11. The portion of the inner layer of the uterus which remains in the uterus after menses is the Character St A) Punctional endometrium B) Myometrium C) Desidua capsulacis D) Basilar 12. Which of these structures is a component of the female external genitalia? A) Labia majora B) External os C) Cervix D) Bulbourethral glands 13. The hormone mainly involved in milk production is A) Oxytocin B) Relaxin C) MSH D) Prolactin Spacing 14. In a regular menstrual cycle of 28 days, the best days of sexual abstinence to prevent pregnancy, are A) 1-5 B) 25-28 C) 17-24 D) 12-16 Before Paragrap fter Paragraph 15. The part of the sperm cell with lots of mitochondria is A) Middle piece B) AcrosomE C) Nucleus D) Principal piece Buiets & Last, No Builets 16) Which of the following muscles move the testes towards the body? A) the cremaster B) the tunica musularis C) the biceps brachii D) the inguinal B) both A and D 2 3 4Explanation / Answer
10) Secondary sex characteristics are features that appear during puberty as enlarged breasts, pubic hair and widened hips in female . Estrogen is the hormone that is responsible for secondary sex characteristics and CNS development in female.
11) Endometrium has three layers: Stratum compactum, Stratum spongiosum and Stratum basalis. First two layers are develop into the Stratum functionalis and degenerate during menses. The basalis layer is unaffected as it supplied by straight arteries.
12) Female external genitalia includes: mons pubis, labia majora, labia minora, clitori and bartholin glands.
13) Hormone responsible for milk production in breast is prolactin.
Oxytocin is responsible for release of milk from breasts.
14) In a regular menstrual cycle of 28 days, the best days of sexual abstinence to prevent pregnancy are 12-16 as the chances of conception is more when ovulation occurs ie; around 14 days.
15) Sperms includes: head (nucleus and acrosome), neck, middle piece and tail.
Middle piece is tubular structure in which mitochondria are spirally arranged. It is called power house of sperm because it gives energy to the sperm to swim in the female genital tract.
16) Movement of testes towards the body in the response of lightly strocking the superior and medial part of thigh is called cremastric reflex. Muscle involved in this reflex is cremastric muscle.
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