The muscles of the back contract to straighten so that you sit at a more erect posture and subsequently the muscles are suddenly stretched as you nod off. Which of the following best represents the sequence of events when you start to nod off?

(1) muscles of the back are stretched
(2) the muscle spindle is stretched
(3) action potentials in sensory neurons of the muscle spindles increase
(4) action potentials in alpha motor neurons of skeletal muscle fibers increase
(5) skeletal muscle of the back contract
A. 1, 2, 3, 4, 5
B. 1, 5, 2, 3, 4
C. 1, 5, 3, 2, 4
D. 5, 2, 3, 4, 1
E. 4, 5, 3, 2, 1


A

Anatomy & Physiology

You might also like to view...

The highest level of motor control involves the basal nuclei and the ________

Fill in the blanks with correct word

Anatomy & Physiology

The nucleolus functions in the synthesis of RNA which becomes part of the ribosomes.

a. true b. false

Anatomy & Physiology

When opposite charges are arranged or opposing sides of a membrane, the membrane is said to be.....

What will be an ideal response?

Anatomy & Physiology

The anatomy of a body part is closely related to its physiology.

Answer the following statement true (T) or false (F)

Anatomy & Physiology