Energy for contraction of cardiac muscle cells comes primarily from
A. ATP that is stored while the heart is not contracting.
B. aerobic respiration in the mitochondria.
C. glycolysis in the cytosol.
D. creatine phosphate.
E. anaerobic respiration in the cytosol.
Answer: B
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Define motor unit
A) A motor unit is the sum total of all the motor neurons going to a specific muscle. B) A motor unit is the sum total of all the muscle fibers in a whole muscle. C) A motor unit is the maximum tension that a whole muscle can generate with maximum stimulation. D) A motor unit is a motor neuron and all the muscle fibers that it controls. E) A motor unit is the sensory neuron going away from and the motor neuron going to a skeletal muscle.
Spicules and trabeculae are found in ________
A) red bone marrow B) yellow bone marrow C) bone matrix D) compact bone E) spongy bone
A bell curve is characteristic of the distribution of phenotypes of a multifactorial trait
because A) people at the extreme ends of the distribution do not survive to reproduce. B) the phenotypes in the middle of the curve correspond to fewer genotypes than the phenotypes at the ends of the distribution. C) the phenotypes at the ends of the curve correspond to fewer genotypes than the phenotypes at the middle of the distribution. D) most people are average for the trait.
Which of the following directly regulates the secretion of insulin?
A) parasympathetic nervous system B) sympathetic nervous system C) blood glucose concentration D) hypothalamus E) tropic hormones from the pituitary gland