What Type of Muscle Tissue Functions to Pump Blood Out

Question

What type of muscle tissue functions to pump blood out of the heart?
A) smooth
B) single-unit skeletal muscle
C) skeletal muscle
D) cardiac muscle

Accepted Answer

Cardiac muscle is the specialized muscle tissue found only in the heart and is responsible for pumping blood out of the heart. It is striated but involuntary, allowing for coordinated contractions of the heart chambers. Smooth muscle is found in the walls of many organs but not the heart, single-unit skeletal muscle is found in small, delicate structures like the iris of the eye or in the walls of the uterus, and skeletal muscle is responsible for movement of the body and is under voluntary control.