What type of muscle cell is responsible for voluntary contraction or movement?
A. Smooth muscle cells
B. Skeletal muscle cells
C. Cardiac muscle cells
Answer: B. Skeletal muscle cells
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The sequence of events in the transmission of an impulse through the heart muscle is a: AV nodeb: AV bundlec: SA noded: through the atriae: through the ventriclesf: bundle branchesg: Purkinje fibers
A. b, a, d, c, f, g, e B. d, b, a, c, f, g, e C. c, d, a, b, f, g, e D. f, g, d, c, b, a, e E. c, d, a, f, b, g, e
Miguel fell out of a tree and broke his fall by putting his arm out, fracturing his radius and ulna. The bones were still aligned at the fracture site. Which specific type of bone fracture is Miguel most likely to have?
A. Stress fracture fracture B. Spiral fracture C. Nondisplaced fracture D. Avulsion fracture E. None of the choices are correct.
Which of the following directly initiates the release of calcium ions from the endoplasmic reticulum?
A. Inositol triphosphate (IP3) B. Phospholipase C C. Calmodulin D. G-proteins
When the upper limb is raised, and the pressure cuff inflated, blood flow to the forearm is stopped, and the hand ________
A) has a blue color B) turns very pale C) first turns red, then becomes white D) flushes red