
Bio3200: Human Physiology
Feb. 24, 2015 EXAM 2 [45 Questions]
Section 1: Complete sentence with one of the two words in square brackets [A. /B. ].
The structure in smooth muscle that is analogous to the z-disk is called [A. a dense body/B. alpha-
actinin].
Relaxation of skeletal muscle occurs as input by the somatic motor neuron [A. increases/B.
decreases].
Adrenal medulla cells function as [A. preganglionic/B.postganglionic] cells within one of the
branches of the autonomic nervous system.
Almost every contraction begins and ends as an [A. isotonic/B. isometric] contraction.
A flexor is a skeletal muscle whose shortening moves attached bones [A. towards/B. away from] one
another.
Steady pressure and texture is detected by [A.Pacinian corpuscles/B. Merkel receptors] in superfiscal
layers of skin.
Corticospinal motor pathways control most [A. fine/B. gross] muscle activity of the fingers.
The reflex that prevents a muscle from exerting too much tension is mediated by the [A. muscle
spindle/B. golgi tendon organ].
A two-point discrimination test is used to measure [A. receptive field size/B. strength of stimulus].
The [A. parasympathetic/B. sympathetic] branch is characterized by a chain of ganglion running
along side of the spinal cord.
Most reflex movements are integrated by [A. the somatosensory cortex/B. the spinal cord].
The bulk of our visceral smooth muscle is made up of [A. muti-unit/B. single-unit] smooth muscle.
Both temperature and pressure receptors are located in the skin. They send their information to the
brain via [A. different/B. the same] neurons.
[A. Fast-twitch/B. Slow-twitch] fibers fatigue more quickly.
The [A. parasympathetic /B. sympathetic] branch dominates during rest and digestion.
Section 2: Multiple Choice. Pick the single best answer based on physiology.
Which statement is CORRECT?
Sensory receptors often respond to more than one kind of physical stimulus.
An adequate stimulus is minimum amount of a stimulus required to activate the receptor.
An adequate stimulus is the form of energy a particular receptor will respond to.
The threshold of a sensory receptor is defined by the frequency of action potentials
elicted by a stimulus.
Sensory transduction corresponds to the degree of protein phosphorylation that occurs
in response to the stimulus.