The number of chromosomes in a human gamete is ____; this is referred to as the _______ chromosome number.
The dartos and cremaster muscles are important to the integrity of the male reproductive system. Which of the following is true about the role they play?
They regulate the temperature of the testes.
Surgical cutting of the ductus deferens as a form of birth control is called a(n) ________.
A 38-year-old male is upset about his low sperm count and visits a "practitioner" who commonly advertises his miracle cures of sterility. The practitioner is a quack who treats conditions of low sperm count with megadoses of testosterone. The patient experiences a huge surge in libido. Would this treatment result in a higher or lower sperm count, and why?
Lower sperm count. High levels of testosterone inhibit the release of GnRH, inhibiting FSH release, resulting in inhibition of spermatogenesis.
The release of _____ encourages interstitial cells to release _____.
luteinizing hormone; testosterone
The constancy of the chromosome number from one cell generation to the next is maintained through ________.
Select the correct statement about male sexual response
Erection is the result of vascular spaces in the erectile tissues filling with blood.
The secretions of the bulbourethral glands neutralize traces of acidic urine in the urethra and serve as a lubricant during sexual intercourse
Which of the following is false regarding the vagina of an adult female?
The pH of the adult vagina is alkaline
What is the role of the corpus luteum?
to produce hormones that maintain the uterine lining during the first months of pregnancy
In humans, separation of the cells at the two-cell state following fertilization may lead to the production of twins, which in this case would be ________.
Which of the following statements about the female reproductive process is not true?
Rebuilding the endometrium is under the control of prolactin.
The small paired structures at the base of the penis that produce a lubricating secretion are the
The following is a list of structures in the male reproductive system:
1. ductus deferens
3. ejaculatory duct
4, 1, 3, 2
Sperm freshly deposited in the female vagina are incapable of fertilizing an egg. What must happen first?
Which of the following is the primary germ layer that forms the basis for the digestive, respiratory, and urogenital systems, and associated glands?
Which of the following is true in reference to what may pass through the placental barriers?
nutrients, respiratory gases, wastes, and alcohol
The foramen ovale and the ductus arteriosus are both examples of:
pulmonary bypass shunts, which serve to bypass the lungs.
At what period of fetal development are all body systems present in at least rudimentary form?
8 weeks post fertilization
Which of the following is not a correct matching of a fetal structure with what it becomes at birth?
ductus arteriosus-ligamentum teres