Tetanic Muscle Contractions Don't Occur in a Normal Cardiac Muscle

question 109

Multiple Choice

Tetanic muscle contractions don't occur in a normal cardiac muscle because

• A) cardiac muscle tissue contracts on its own.
• B) neural stimulation is lacking.
• C) the refractory period lasts until the muscle relaxes.
• D) the refractory period ends before the muscle reaches peak tension.
• E) potassium channels outnumber sodium channels.

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Definitions:

Proprioceptors

Sensory receptors located in muscles, tendons, and joint capsules that help to provide information about body position and movement.

Photoreceptors

are specialized cells in organisms that respond to light, allowing for vision and light-guided behaviors.

Mechanoreceptors

Sensory receptors that respond to mechanical pressure or distortion, involved in detecting touch, pressure, and sound.

Retinal Disorders

Retinal disorders are a group of diseases affecting the retina, a layer of tissue at the back of the eye, which can impair vision and lead to blindness.