★ Must-know
📌 The body contains cardiac, skeletal, and smooth muscle; cardiac and smooth muscle are involuntary, while skeletal muscle is voluntary.
Cardiac muscle forms the walls of the heart chambers, contracts involuntarily, and, when the heart is healthy, does not fatigue.
Skeletal muscles attach to bones and enable conscious movement, strength, and power; they also maintain posture and generate heat that helps maintain normal body temperature.
Smooth muscles work involuntarily in and around organs such as the intestines and blood vessels, and help move substances around the body to supply cells with oxygen and nutrients.
Further detail
1. Which classification correctly describes voluntary control of the three muscle types?
2. Which statement describes cardiac muscle in a healthy heart?
3. During a standing exercise, which combination of functions can skeletal muscles perform?
Which three muscle types are found in the body?
Cardiac, skeletal, and smooth muscle.
Which muscle types are involuntary?
Cardiac and smooth muscle.
Where is cardiac muscle located?
In the walls of the heart chambers.
What is cardiac muscle’s fatigue behavior in a healthy heart?
It does not fatigue.
What do skeletal muscles attach to?
Bones.
What do skeletal muscles generate to help maintain body temperature?
Heat.
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