In the coronary circulation, oxygen-rich blood is provided to the heart muscle by the ________
A) great middle and small cardiac veins
B) right and left coronary arteries
C) coronary sinus
Answer: B
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The cytoskeleton component composed mainly of the protein actin is a __________.
Fill in the blank(s) with the appropriate word(s).
In spermatogenesis, meiosis results in the formation of
A. one sperm cell with 23 chromosomes. B. two sperm cells with 46 chromosomes each. C. four sperm cells with 23 chromosomes each. D. four sperm cells with 46 chromosomes each. E. one sperm cell with 46 chromosomes.
Answer the following statements true (T) or false (F)
1. The gray rami communicantes consist of myelinated postganglionic fibers. 2. Splanchnic nerves are mixed motor and sensory nerves. 3. The autonomic nervous system may cause activation or inhibition, depending on the division that is active and the target that is affected. 4. The celiac ganglion is primarily associated with the sympathetic division. 5. The sympathetic chain is composed of collateral ganglia.
A traveling wave of excitation is known as a(n) ________
A) local potential B) graded potential C) nerve signal D) action potential E) depolarizing signal