Transverse tubules and sarcoplasmic reticulum are well developed in
A) cardiac muscle fibers. B) skeletal and cardiac muscle fibers.
C) smooth muscle fibers. D) skeletal muscle fibers.
B
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Which of the following does NOT help to move blood back to the heart?
A) vein valves B) skeletal muscle contraction C) chest expansion D) vein dilation
Which transport process requires a carrier molecule but does not use cellular energy?
A. Facilitated diffusion B. Osmosis C. Diffusion D. Active transport E. Endocytosis
Rapid diffusion of oxygen and carbon dioxide through the air sacs (alveoli) of the lungs takes place through ________ epithelium.
A. simple squamous B. simple columnar C. keratinized stratified squamous D. simple cuboidal E. nonkeratinized stratified squamous
The nonspecific defense by which complement proteins attach to sugars or proteins on the surface of foreign cells is called complement fixation
Indicate whether the statement is true or false