Valves in veins
A. make the use of a skeletal muscle pump unnecessary for venous blood flow.
B. are the leading cause of high blood pressure.
C. are found only in the largest veins.
D. cause venous blood flow to go in only one direction.
E. are formed of the tunica media.
D
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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.
Which of the following factors does NOT contribute to individual differences in the characteristics of brain waves?
A. Type of activity the person is engaged in B. Personality C. Age D. Gender E. All of these factors contribute to individual differences in the characteristics of brain waves.
The ________ is the bony point of the elbow.
A. styloid process B. trochlea C. coronoid process D. olecranon
A drop in blood glucose concentration would likely cause
a. increased release of ACh onto autonomic effectors b. decreased frequency of impulses along short preganglionic neurons c. increased frequency of autonomic impulses from the lumbar region of the spinal cord d. decreased binding of neurotransmitters to alpha-2 receptors in the pancreas e. all of the above