What is the role of acetylcholinesterase at a synapse?
A. It releases calcium ions.
B. It breaks down acetylcholine.
C. It stimulates the post-synaptic neuron.
D. All apply.
Answer: B
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Sex _________ (estrogen, testosterone) stimulate osteoblasts and promote the growth of long bones, especially in adolescence.
Fill in the blank(s) with the appropriate word(s).
The venous valves
a. actively contract to force blood uphill against gravity b. passively close to prevent the backflow of blood in the veins c. prevent blood from flowing into lymphatic vessels d. primarily prevent blood plasma from moving into the interstitial fluid e. perform all of the above functions
Which analogy best describes the relationship between anabolism and catabolism?
A. Building up and adding on B. Black and white C. Frontal and peripheral locations D. Biological and chemical
Which of the following is most important for the determination of stimulus type?
A. the relative sensitivity of different receptors to different stimulus energies B. the presence of polymodal neurons in the sensory pathway C. the intensity of a stimulus D. the location on the body where a stimulus is applied E. propagation of a signal along a nonspecific ascending pathway