The heart initiates its own action potentials without any external influence

Indicate whether the statement is true or false


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Anatomy & Physiology

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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

Anatomy & Physiology

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

Anatomy & Physiology

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.

Anatomy & Physiology

Which heart chamber has the thickest muscular walls?

a. right ventricle b. right atrium c. left ventricle d. left atrium

Anatomy & Physiology