Which statement is false regarding mineral deposition in bone?
A. Osteoblasts produce the bone's hydroxyapatite crystals.
B. Calcium phosphate circulates through the blood and other bodily fluids.
C. Osteoblasts allow hydroxyapatite crystals to be deposited.
D. Osteoblasts produce the collagen fibers of bone.
Answer: A
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Which is TRUE about the comparison of excitation-contraction coupling in cardiac muscle with that in skeletal muscle?
A. Extracellular Ca2+ plays a major role in cardiac but not skeletal muscle. B. The mechanism for Ca2+ release from the sarcoplasmic reticulum is the same in both types of muscle. C. Intracellular Ca2+ stores are necessary for contraction in skeletal muscle, but not in cardiac muscle. D. Troponin sites are completely saturated immediately after Ca2+ release in both types of muscle. E. There is no net change in total intracellular Ca2+ concentration in either muscle.
To stimulate skeletal muscle contraction, acetylcholine must cross the _____ of the neuromuscular junction and bind to receptors on the motor endplate
a) node of Ranvier b) synaptic cleft c) sarcolemma d) synaptic end bulb e) transverse tubule
As long as this is present in a bone, bone growth can continue.
a. diaphysis b. epiphyseal plate c. epiphysis d. osteoclasts
The ________ is the fold of the dura mater that separates the cerebral hemispheres
A) falx cerebelli B) endosteal layer C) falx cerebri D) tentorium cerebelli