The heart initiates its own action potentials without any external influence
Indicate whether the statement is true or false
T
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Unlike B cells, which secrete antibodies that can attack antigens at long distances, __________ must directly contact their targets, a process known as __________ immunity
Indicate whether the statement is true or false
An increase in metabolic rate would alter body temperature and trigger a compensatory
A. inhibition of sweat glands and vasoconstriction in blood vessels of the skin. B. stimulation of sweat glands and vasodilation in blood vessels of the skin. C. inhibition of sweat glands and vasodilation in blood vessels of the skin. D. stimulation of sweat glands and vasoconstriction in blood vessels of the skin.
Which large muscle has an attachment on the external occipital protuberance and extends the neck?
A. Splenius capitis B. Longissimus C. Sternocleidomastoid D. Trapezius E. Semispinalis capitis
Which heart chamber has the thickest muscular walls?
a. right ventricle b. right atrium c. left ventricle d. left atrium