return to biology 105 syllabus
Biology of Exercise
Quiz 3, part 3 Answers
Each of the following statements is FALSE. In one or
two sentences (no more!), indicate why. (3 points each, 12 total)
a. Joint proprioreceptors detect lactic acid in joint areas and relay the information towards the central nervous system.
Joint proprioreceptors detect movement and position of joints, not lactic acid.
b. The brain can differentiate among various sensory modalities (i.e. smell, vision, hearing) because the action potentials elicited by each modality are carried by afferent nerve pathways towards the central nervous system have distinctly different shapes.
Action potential do not have different shapes, modalities are differentiated because different nerves carry the information to different brain regions.
c. Activation of skeletal muscle contraction is mediated through the efferent nervous system pathway called the parasympathetic system.
Activation of skeletal muscle is mediated by the the voluntary arm of the efferent nervous system called the somatic system.
d. Air flows into the lungs during inspiration because positive pressure is generated in the mouth cavity, air then flows from high to low pressure into the lungs.
Air flows into the lungs during inspiration because negative pressure
is generated in the chest cavity, air then flows from high to low pressure
into the lungs.