Which of the following statements concerning water reabsorption is correct?
a. water reabsorption is under control of vasopressin throughout the length of the nephron.
b. the ascending limb of the loop of Henle is always impermeable to water.
c. vasopressin makes the distal and collecting tubules impermeable to water.
d. fifteen percent of the filtered water osmotically follows the absorption of Na+ and other solutes in the proximal tubule.
e. water reabsorption is passive in the early portions of the nephron but is active in the distal portions of the nephron.
B
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A) is an electrical and/or chemical signal that travels to the effector. B) is the disturbance or change that sets the pathway in motion. C) is the minimum stimulus that must be achieved to set the reflect response in motion. D) evaluates incoming signals and compares it with the setpoint.
The electrical signals that are propagated along axons, regulating and coordinating body activities, are known as _____.
A. graded potentials B. neurotransmitters C. action potentials
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Indicate whether the statement is true or false
In the male, the process in which sperm cells, secretions of the prostate, and secretions of the seminal vesicles accumulate in the prostatic urethra is called:
A) erection. B) emission. C) ejaculation. D) orgasm.