What is found within the central canal of an osteon?
A. Blood vessels
B. Osteoclasts
C. Osteocytes
D. Primarily hydroxyapatite
E. Primarily collagen
A. Blood vessels
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What is ATP used for in the process of muscle contraction?
A. Power stroke of myosin cross-bridge B. Pump calcium ions back into the sarcoplasmic reticulum C. Release of myosin from actin D. All apply.
Which of the choices below is not a role of the pleura?
A) allows the lungs to inflate and deflate without friction B) helps divide the thoracic cavity into three chambers C) helps limit the spread of local infections D) aids in blood flow to and from the heart because the heart sits between the lungs
What is the purpose of surfactant that lines each alveolus?
A. Gives the lungs their elasticity B. Increases the surface tension of water C. Keeps the alveoli from collapsing