The force generated by a single muscle fiber can be increased by
A) increasing the asynchrony of recruitment only.
B) increasing muscle length beyond optimal only.
C) increasing frequency of action potentials and increasing muscle length beyond optimal only.
D) increasing frequency of action potentials only.
D) increasing frequency of action potentials only.
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The area where the major vessels lead to and from the heart's chambers is called the __________ of the heart. The pointy, inferior portion is called the ___________.
A. apex; base B. atrium; ventricle C. ventricle; atrium D. base; apex E. endocardium; epicardium
Where in the brain are the neurons that generate the breathing rhythm located? Where are the peripheral chemoreceptors located?
What will be an ideal response?
Bursae are saclike structures that are commonly found between bone and
a) skin. b) muscle. c) ligaments. d) tendons. e) all the other answer selections.
Which of the following is NOT a chemical barrier that helps prevent entry of microbes into the body tissues?
A. Sebum B. Normal flora C. Lysozyme D. Cytokines