Cardiac muscle cells
A. have smooth ER but no T tubules.
B. form the heart valves.
C. are maintained by an extensive capillary network.
D. develop a significant oxygen debt during systole.
E. do not contain actin and myosin like skeletal muscle cells.
C
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Why doesn't semen enter the urinary bladder during ejaculation?
A) The smooth muscle sphincter at the base of the urinary bladder closes. B) There is no urge to urinate during sexual intercourse because of the suppression of LH by testosterone buildup in the blood. C) Ejaculation is a parasympathetic reflex resulting in no response by urinary contraction muscles. D) There is no common duct between the reproductive system and the urinary system.
____________ is a decreased responsiveness to repetitive stimuli, whereas __________ is an increased responsiveness to mild stimuli following a strong stimulus
Fill in the blank(s) with correct word
Which of the following is composed of myosin molecules?
A. I bands B. Z disks C. Thick myofilaments D. Sarcolemma E. Tropomyosin
A primary spermatocyte is ________; a secondary spermatocytes is______.
A. tetraploid; diploid B. diploid; diploid C. diploid; haploid D. haploid; haploid E. haploid; tetraploid