The sphincter muscle located between the small intestine and the large intestine is the ________.
Fill in the blank(s) with the appropriate word(s).
ileocecal valve
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Bone plays a central role in the regulation of blood levels of
A) potassium. B) iron. C) sulfate. D) calcium. E) sodium.
Which of the following is the first step in the sliding mechanism of muscle contraction?
A) A carbohydrate molecule is broken down to produce energy. B) Thin filaments are pulled toward the center of the sarcomere. C) The cross-bridges detach and return to their original positions. D) The myosin heads of the thick filaments bind to active sites on the thin filaments. E) Myosin heads pivot toward the M line when cross-bridge binding occurs.
Which of the following accurately compares sections of spinal white matter?
A. A fasciculus is smaller than a tract. B. A fasciculus is larger than a funiculus. C. A fasciculus is larger than a tract. D. A fasciculus is smaller than a funiculus.
What is the term for the exchange of gases between air in the pulmonary alveoli and alveolar capillaries?
A. Aerobic respiration B. Pulmonary ventilation C. Alveolar gas exchange D. Gas transport E. Systemic gas exchange