Antibodies can inactivate an antigen in many ways, including complement fixation, neutralization, and opsonization
Indicate whether the statement is true or false
TRUE
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Which event typically occurs at the start of a cardiac cycle?
A) Ventricular blood pressure drops until reverse blood flow pushes the cusps of the semilunar valves together. B) Atrial contraction forces a small amount of blood into the relaxed ventricles. C) The semilunar valves open and blood is ejected. D) Ventricular contraction pushes the atrioventricular valves closed. E) The atrioventricular valves opens and the ventricles fill passively.
What function is served by motile cilia on epithelial cell surfaces?
A) produce muscle contraction B) propel material across the cell surface C) propel sperm D) move organelles E) move materials through cytoplasm
An autoimmune disease that destroys acetylcholine receptors on skeletal muscles is
A. fibromyalgia. B. osteoarthritis. C. muscular dystrophy. D. myasthenia gravis.
The photoreceptor cells are located
A. on the surface of the retina. B. in the ganglionic layer of the retina. C. in the photoreceptive layer of the retina. D. in the choroid layer of the retina. E. in the pigment cell layer of the retina.