Most of the reabsorption of filtered calcium is unregulated and occurs in the ________, but an additional amount can be reabsorbed in the _________, depending on the plasma concentration of parathyroid hormone
A. proximal convoluted tubule, distal convoluted tubule
B. distal convoluted tubule, proximal convoluted tubule
C. proximal convoluted tubule, descending loop of Henle
D. distal convoluted tubule, medullary collecting ducts
E. distal convoluted tubule, renal corpuscle
A
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The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are
A. skeletal. B. cardiac. C. smooth. D. cardiac and smooth. E. cardiac and skeletal.
Describe the events that must occur in order for sperm to penetrate an egg. What prevents more than one sperm from entering? In the case of twins, how many sperm entered the egg? Why must a man have millions of sperm in a semen sample to be considered fertile? If only one sperm were present in the semen and that sperm managed to find its way to the egg, could it fertilize the egg? Explain.
What will be an ideal response?
At the rate of 125 ml of filtrate/minute, estimate the amount of filtrate formed in 24 hours.
A. 45 liters B. 90 liters C. 180 liters D. 125 liters E. 200 liters
A reflex that protects limbs by removing them from painful stimuli is the ________ reflex.
A. Golgi tendon B. alternating C. crossed extensor D. withdrawal E. stretch