Nurse cells secrete inhibin, which regulates the rate of sperm production.
Answer the following statement true (T) or false (F)
True
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If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,
A) the membrane will depolarize. B) the intracellular concentration of calcium ion will increase. C) the stroke volume will increase. D) the heart rate will increase. E) the heart rate will decrease.
If fibers in the ascending tract of the spinal cord are cut, the affected person will have a
loss of motor functions below the injury. Indicate whether the statement is true or false
Which of the following is not an accessory organ of the male reproductive system?
A. gonads B. prostate gland C. scrotum D. seminal vesicle
Collections of specialized cells and extra-cellular substances around them are known as a(n) __________.
A. organelle
B. tissue
C. organ
D. organism