PHYSIOLOGY EXAM 2 WITH CORRECT QUESTIONS AND ANSWERS.

PHYSIOLOGY EXAM 2 WITH CORRECT
QUESTIONS AND ANSWERS.

Are the following axon classes ordered from largest to smallest, or smallest to largest?

- A-alpha

- A-beta

- A-gamma

- A-delta

-B

- C - CORRECT ANSWERS.✔️✔️largest to smallest diameter



Are the following axon classes ordered from slowest to fastest, or fastest to slowest?

- A-alpha

- A-beta

- A-gamma

- A-delta

-B

- C - CORRECT ANSWERS.✔️✔f️ astest to slowest



Of the following fibers, which has the lowest threshold of excitability? which has the highest?

- A-gamma

- A-beta

- A-delta

-C



what does this mean for when they will produce an action potential (AP) - CORRECT ANSWERS.✔️✔A
️-
beta has lowest threshold (most sensitive)

- produce AP first

, C has highest threshold

- produce AP last



What type of sensations do Group IV (Type C) sensory axons send to spinal cord? - CORRECT
ANSWERS.✔️✔️deep, dull, diffuse (not localized) muscle pain sensation



Which axon types transmit sensations of pain & temperature to CNS? - CORRECT ANSWERS.✔️✔️A-
delta & C



Which axons innervate the muscle spindle? - CORRECT ANSWERS.✔️✔️Group Ia and II (Sensory A-alpha
and A-beta)

A-gamma (motor)



Roman numerals are used to name what type of axons?

(not an instructional objective, just a note) - CORRECT ANSWERS.✔️✔️sensory only!

- A-alpha, beta, delta, & C



what axon produces the quickest transmission of pain to the CNS? - CORRECT ANSWERS.✔️✔A
️ -delta

(faster than C!)



what is the direct cause of an AP in the membrane of a skeletal muscle cell? - CORRECT
ANSWERS.✔️✔️End Plate Potential (EPP)



"sensory unit" refers to:

(not an objective, just FYI) - CORRECT ANSWERS.✔️✔️receptor + afferent (sensory) axon



how does the sensory unit respond when the amplitude of the adequate stimulus is increased? -
CORRECT ANSWERS.✔️✔️increase in the receptor potential amplitude

AND

increase in afferent AP frequency