In a skeletal muscle fiber, Ca2+ is released from

a. ACh receptors.
b. the motor end plate.
c. the sarcoplasmic reticulum.
d. the sarcolemma and T-tubules.


c. the sarcoplasmic reticulum.

Anatomy & Physiology

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A heart attack that starts out slowly with little or no pain is called a(n) ________.

A. ischemia B. embolus C. silent MI D. stroke

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The process by which most of the material in the nephron moves back into the blood is called ________

A) Secretion B) Filtration C) Micturition D) Reabsorption

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Postpartum, estrogen and progesterone levels

A. fall gradually. B. fall steeply. C. rise steeply. D. rise gradually.

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During inspiration a person's vocal cords are typically

A. adducted. B. abducted. C. tensed. D. relaxed.

Anatomy & Physiology