What causes the heart valves to open and close?
a. action potentials in vagus nerve
b. electrical connection with vagus nerve
c. differences in blood pressure across the valve
Answer: c. differences in blood pressure across the valve
You might also like to view...
The hormone controlling erythropoiesis is produced in what organ?
a. pancreas. b. brain. c. heart. d. kidney. e. intestine.
Answer the following statements true (T) or false (F)
1. Dynamic loading during gymnastics has been show to affect bone size and strength more than muscle mass. 2. The effects of several months intervention treatment with whole body vibration appear to include improved bone mineral density. 3. The link between cessation of menses and osteoporosis is estrogen deficiency. 4. In practical terms, a fast childhood game of hopscotch favors bone building over a very slow one. 5. Long distance runners have a much higher prevalence of secondary amenorrhea than the general population.
What is the correct sequence of events at a synapse?
(1) neurotransmitter release/diffusion (2) generation of action potential in the postsynaptic cell axon (3) arrival of nerve impulse at synaptic knob in presynaptic cell (4) removal of neurotransmitter molecules from receptors (5) binding of neurotransmitter to receptors A) 3, 1, 5, 2, 4 B) 2, 3, 1, 4, 5 C) 3, 1, 5, 4, 2 D) 1, 5, 4, 2, 3 E) 2, 3, 1, 5,
Preprohormones give rise to lipophilic hormones
Indicate whether the statement is true or false