A muscle fiber exposed to a series of stimuli of increasing frequency combines
individual twitches (summation) which results in
A) flaccid muscles. B) muscle tone.
C) complete sustained contraction. D) a latent period.
C
You might also like to view...
Which of the following units is unique to three-dimensional Cartesian coordinate systems (i.e. do not exist in 2-D systems)?
A. x B. y C. z D. all of the above are unique to 3-D systems
What is the correct sequence of events along an axon that follows a membrane
reaching threshold potential? 1. The membrane depolarizes. 2. Sodium channels open and sodium ions diffuse inward. 3. The membrane repolarizes. 4. Potassium channels open and potassium ions diffuse outward. A) 1, 2, 4, 3 B) 4, 1, 3, 2 C) 3, 2, 4, 1 D) 2, 1, 4, 3
The eustachian tube connects the middle ear to the ____
a. pharynx b. larynx c. outer ear d. frontal sinuses e. cochlea
In normal adults, red blood cells are formed in
A) yellow bone marrow. B) the spleen. C) red bone marrow. D) the liver. E) lymph nodes.