Which of the following best describes why it is necessary that the testes descend into the scrotum?
Jaundice, implantation
Temperature, fertility
Infection, sterility
Cyanosis, ischemia
The Correct Answer is B
A. Jaundice, implantation: Jaundice and implantation are unrelated to testes or scrotum.
B. Temperature, fertility: The scrotum maintains a temperature slightly cooler than body temperature, which is necessary for sperm production and fertility.
C. Infection, sterility: While infection can cause sterility, the descent of the testes primarily addresses temperature regulation.
D. Cyanosis, ischemia: These are circulatory issues not directly related to testicular descent.
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Related Questions
Correct Answer is D
Explanation
A. Ovaries: The ovaries produce ova and hormones but do not have these layers.
B. Fallopian tubes: These are passageways for eggs and do not have an endometrium or myometrium.
C. Vagina: The vagina has mucosal and muscular layers, but not a myometrium or endometrium.
D. Uterus: The endometrium (inner lining) and myometrium (muscular layer) are both parts of the uterus.
Correct Answer is A
Explanation
A. During labor, pressure of baby's head on cervix stimulates release of oxytocin:
This is a classic example of positive feedback-oxytocin increases uterine contractions, which increase pressure and stimulate more oxytocin release.
B. Menstrual cycle:
The menstrual cycle involves both positive and negative feedback mechanisms, but is not a pure example of positive feedback.
C. Blood glucose regulation:
This is an example of negative feedback involving insulin and glucagon.
D. Wake/sleep cycle:
This is regulated by circadian rhythms, not primarily a feedback loop of endocrine hormones.
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