When the nervous system signals a muscle to contract, ________ ion channels open.

A. phosphorus
B. sodium
C. myosin
D. actin


Answer: B

Anatomy & Physiology

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Breathing, which involves the physical movement of air into and out of the lungs, is __________.

a. pulmonary ventilation b. alveolar ventilation c. internal respiration d. gas diffusion

Anatomy & Physiology

The most common type of joint inflammation is called

A) rheumatism. B) degenerative joint disease. C) rheumatoid arthritis. D) osteoporosis. E) gouty arthritis.

Anatomy & Physiology

A long, unbranched polysaccharide found in the extracellular matrix of connective tissue is ________.

A. tropocollagen B. hyaluronic acid C. proteoglycan D. chondronectin

Anatomy & Physiology

The release of a mature egg from the ovary is called ________.

A. ovulation B. fertilization C. menses D. menopause

Anatomy & Physiology