Which generalization concerning movement by skeletal muscles is not true?
A) Muscles produce movement by pulling on bones.
B) The bones serve as levers.
C) During contraction the two articulating bones move equally.
D) The movements produced may be of graded intensity.
C) During contraction the two articulating bones move equally.
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If you wanted to pick up something heavier than your pencil (such as your book), you would need to have a stronger muscle contraction. In what way might you accomplish this?
a. stimulate more motor units b. decrease the frequency of stimulation to allow a more prolonged contraction to occur c. decrease the refractory period d. block acetylcholinesterase at the neuromuscular junction to allow acetylcholine to function longer e. none of these answers.
A ________ is a basic unit or packet of light energy
A) wavelength B) color C) photon D) rhodopsin E) vibration
In biological systems, radiant heat exchange occurs through electromagnetic radiation in the __________ range
Fill in the blank with the correct word.
Which of these is not found in the karyotype of a normal human male?
A. X and Y chromosomes B. 23 pairs of homologous chromosomes C. 92 DNA molecules D. 46 chromosomes E. 46 chromatids