The substance produced by the lungs to reduce surface tension is called ________.
Fill in the blank(s) with the appropriate word(s).
surfactant
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Platelets can initiate the clotting process by
A) releasing enzymes and other factors at the appropriate times. B) breaking down cellular debris by phagocytosis. C) attracting white blood cells to the site of the injury or infection. D) coagulating plasma proteins and cellular debris into a plug. E) None of the answers are correct.
Which of these chemical substances, when released into the blood, would cause blood pressure to decrease?
A. epinephrine B. angiotensin C. aldosterone D. vasopressin E. atrial natriuretic factor
Define stretch reflex
A) A stretch reflex is an example of a withdrawal reflex that contracts the flexor muscles of a limb in response to a painful stimulus. B) A stretch reflex is a polysynaptic reflex that activates extensor muscles in the opposite leg or arm when a flexor reflex is activated. C) A stretch reflex is a monosynaptic reflex that activates extensor muscles in the opposite leg or arm when a flexor reflex is activated. D) A stretch reflex is a monosynaptic reflex that provides regulation of skeletal muscle length. E) A stretch reflex is a polysynaptic reflex that provides regulation of skeletal muscle length.
What gives eyes their characteristic color?
A) the density and distribution of melanocytes in the pupil B) the density and distribution of melanocytes in the iris C) the density and distribution of blood vessels in the vascular layer D) the density and distribution of blood vessels in the retina E) the density and distribution of melanocytes in the retina