In the fast block to polyspermy, binding of sperm opens up ________ channels, which depolarizes the egg membrane and prevents the entrance of any more sperm.
A. K+
B. Ca2+
C. Mg2+
D. Na+
E. Cl-
Answer: D
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The portion of the nephron that attaches to the collecting system is the
A) proximal convoluted tubule. B) loop of Henle. C) distal convoluted tubule. D) collecting duct. E) minor calyx.
The second heart sound is produced by the
a. opening of the AV valves. b. closing of the AV valves. c. opening of the semilunar valves. d. closing of the semilunar valves. e. blood rushing through the AV valves during diastole, creating a turbulent flow.
Every cell of the morula and inner cell mass of the blastocyst have the ability to become any type of cell.
Answer the following statement true (T) or false (F)
The gap between two communicating neurons is termed ________
A) synaptic cleft B) cell body C) effector D) Schwann cell E) node of Ranvier