Twitch summation

a. is a means by which gradation of muscle contraction may be accomplished.
b. results from increasing the number of motor units that are firing within a muscle.
c. results from increasing the frequency at which motor units are firing within a muscle.
d. both (a) and (b) above.
e. both (a) and (c) above.


E

Anatomy & Physiology

You might also like to view...

As the result of an accident, Bill suffers a dislocated jaw. This injury would involve the

A) stylohyoid ligaments. B) hyoid bone. C) condylar process of the mandible. D) alveolar process of the mandible. E) greater horn of the hyoid bone.

Anatomy & Physiology

Which lymph nodes would likely become inflamed with an ear infection?

A) cervical lymph nodes B) thoracic lymph nodes C) intestinal lymph nodes D) none of the lymph nodes, but the spleen E) axillary lymph nodes

Anatomy & Physiology

Generally, people have ________ number of melanocytes ________.

A. a higher; if they live in the southern hemisphere B. a lower; if they live in colder climates of the northern hemisphere C. about the same; no matter where they live D. a highly variable; irrespective of where they live E. a higher; if they live in the warmer climates near the equator

Anatomy & Physiology

The muscle that abducts and extends the arm is the ________.

A. deltoid B. coracobrachialis C. pectoralis major D. latissimus dorsi

Anatomy & Physiology