Peristaltic contractions of the ampulla, which push fluid and spermatozoa into the prostatic urethra, are called __________.
a. subsidence
b. ejaculation
c. detumescence
d. emission
Ans: d. emission
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A clot that breaks loose and travels in the blood flow is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following can act on receptors inside the target cell that directly activate specific genes?
A) growth hormone B) melatonin C) testosterone D) calcitonin
Explain how the heart of a double-pithed frog can continue to contract in an organized manner after the nervous system is destroyed
What will be an ideal response?
Compare obligatory water reabsorption with facultative water reabsorption
A) Obligatory water reabsorption cannot be prevented, whereas facultative water reabsorption can be precisely controlled. B) Obligatory water reabsorption can be precisely controlled, whereas facultative water reabsorption cannot be prevented. C) Obligatory water reabsorption occurs in the distal convoluted tubule under control of ADH, whereas facultative water reabsorption occurs in the proximal convoluted tubule following the osmotic gradient. D) Obligatory water reabsorption occurs in the ascending limb of the nephron loop, whereas facultative water reabsorption occurs in the descending limb of the nephron loop. E) Obligatory water reabsorption is responsible for regulating the final concentration and volume of water lost in urine, whereas facultative water reabsorption is responsible for about 85 percent of water reabsorbed out of the filtrate.