Question

autorhythmic cells are specialized cells capable of generating electrical impulses spontaneously without any external input. which of the following types of muscle contain autorhythmic cells? a.) cardiac b.) smooth c.) all of the above d.) skeletal

Explanation:

• Cardiac muscle: Contains autorhythmic cells (pacemaker cells) that initiate electrical impulses to regulate heartbeats.
• Smooth muscle: Some types (e.g., in the digestive tract) have autorhythmic cells (interstitial cells of Cajal) that help with rhythmic contractions.
• Skeletal muscle: Does not have autorhythmic cells. It requires nervous system stimulation to contract.

Since both cardiac and smooth muscle have autorhythmic cells, the option “All of the above” (if it includes a and b) would be correct. Assuming the options are as presented (a - cardiac, b - smooth, c - all of above, d - skeletal), and if “all of the above” refers to a and b (as skeletal is incorrect), then c is correct.

Answer:

C. All of the above