When a blood sample is spun down in a centrifuge tube, what is found in the buffy coat?
A. Red blood cells and platelets
B. Red blood cells
C. Blood plasma
D. White blood cells and platelets
E. Platelets
Answer: D
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When a neuron changes its ion permeability from the resting state,
A) a variety of gated ion channels may open or close, Na+ channels may open, allowing Na+ to enter the cell, and K+ channels must open, allowing K+ to enter the cell. B) a variety of gated ion channels may open or close. C) K+ channels must open, allowing K+ to enter the cell. D) Na+ channels may open, allowing Na+ to enter the cell. E) only a variety of gated ion channels may open or close and Na+ channels may open, allowing Na+ to enter the cell.
Answer the following questions true (T) or false (F)
1. Vaccinations elicit a primary immune response so that secondary immune responses are rapid and symptoms are mild. 2. Bacterial infections and viral infections progress through an identical sequence of events during the immune response. 3. Immunodeficiency disorders can result from a failure of one component of the immune system.
The smallest structural unit that exhibits the characteristics of living things is
A. a cell. B. a system. C. an individual. D. an organ. E. tissue.
Which of the following receptor type is mismatched with its sensation?
A. Hair follicle receptors - slight bending of the hair B. Merkel disks - light touch C. Meissner corpuscles - two-point discrimination D. Pacinian corpuscles - vibration E. Ruffini end organs - temperature