The stress relaxation response enables hollow organs, like the stomach, to accommodate increases in the volume of its contents. Typically, an upper limit is placed on the volume, however, by
a. reflex contraction initiated in response to stretch.
b. tension due to stretching of the intermediate filaments within the smooth muscle.
c. inelastic connective tissue associated with the smooth muscle of the organ.
d. the number of cross-bridge sites present on the myosin filaments.
C
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The epithelium that allows rapid diffusion of oxygen and carbon dioxide through the air sacs of the lungs is.
A) Simple squamous. B) Simple cuboidal. C) Simple columnar. D) Stratified squamous-keratinized. E) Stratified squamous-nonkeratinized.
Which of the following statements concerning smooth muscle is true?
A. It contains many sarcomeres. B. Caveolae seem to take the place of the myofibrils. C. A calcium-calmodulin complex initiates cross-bridge formation. D. The cells are large and multinuclear. E. It has a well developed sarcoplasmic reticulum.
This figure shows a cross section of a vertebra and the spinal cord. What structure does number 1 indicate?
A. Epidural space B. Pia mater C. Subarachnoid space D. Central canal E. Dura mater
The mouth opens into the
A) laryngeal cavity. B) mouth cavity. C) pharynx. D) nasal cavity. E) buccal cavity.