The refractory period in cardiac muscle is much shorter than the refractory period in skeletal muscle to ensure that the heart can quickly be restimulated to produce alternate periods of contraction and relaxation
Indicate whether the statement is true or false
F
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The cells that are formed during spermatogenesis by meiosis I are called
A) spermatogonia. B) primary spermatocytes. C) secondary spermatocytes. D) spermatids. E) sperm.
Two ATP molecules could provide energy for a sodium-potassium pump to move ____ ions out of the cell for every ____ ions it moves into the cell
a. 6 Na+; 3 K+ b. 2 Na+; 3 K+ c. 3 K+; 6 Na+ d. 3 K+; 2 Na+ e. 12 Na+; 6 K+
Which of the following is the correct description of the pia mater?
A. The layer of the meninges that is thin and weblike B. The outermost layer of the meninges C. The innermost layer of the meninges D. The layer of the meninges that is much thicker and tougher than the others E. The middle layer of the meninges
Which is the best definition of the term ligand?
A. a receptor composed of protein B. a molecule or ion that binds to a protein C. any molecule found in the intracellular fluid D. any molecule found in the extracellular fluid E. a carbohydrate molecule that binds weakly to membrane phospholipids