Gap junctions connect the cytoplasm of a cell with the cytoplasm of an adjacent cell
Indicate whether the statement is true or false
T
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Tubular reabsorption involves all of the following except
A) active transport. B) facilitated diffusion. C) secondary active transport. D) osmosis. E) phagocytosis.
Why do people with Parkinson disease experience resting tremors?
A. Damage to the cerebellum alternately activates agonist/antagonist muscle pairs. B. Excess glutamate is released in the premotor areas of the motor cortex. C. Dopamine-secreting tumors directly activate alpha motor neurons. D. Acetylcholinesterase at neuromusclular junctions is inactivated. E. Activation of the sensorimotor cortex is reduced when the substantia nigra fails to deliver dopamine to the basal nuclei.
Although they are not a site of lymphocyte formation, ________ lymphatic structures provide sites where immune responses are initiated.
A. secondary B. hemopoietic C. red marrow D. primary
In fetal development, hemocytoblasts begin to colonize red mone marrow at approximately
A. 10 weeks. B. 10 days. C. 8 months. D. 5 months.