Question

which type of muscle works involuntarily and is located in the walls of the heart?
skeletal muscle
smooth muscle
cardiac muscle
voluntary muscle
what percentage of total body weight is typically comprised of muscle?
60 - 70%

Explanation:

1. Cardiac muscle is involuntary and found in the heart - wall. Skeletal muscle is voluntary, smooth muscle is in other organs like intestines, and voluntary muscle is not the correct term for heart - muscle.
2. Muscle typically makes up 40 - 50% of total body weight. Among the given options, 50 - 60% is the closest range.

Answer:

1. C. Cardiac Muscle
2. The closest option is not fully visible, but if we assume the visible part is 50 - 60%, then that would be the answer.