Question

Rapid, repeated stimulation produces a sustained muscle contraction called ________.

		tetanus
		muscle twitch
		muscle tone
		spasm
		muscle tension

Rigor mortis demonstrates that skeletal muscle tissue
  

		can maintain cross bridges even after death
		will not relax after death without ATP until cross bridges deteriorate
		none of the above
		all of the above
		normally requires energy to end as well as to start a contraction

Which of the following is NOT TRUE?

		All muscle tissue is contractile
		Muscles use the skeleton as leverage points as they push against bones to produce body movement
		Skeletal muscle is voluntary but smooth muscle is not
		Superficial fascia holds skin to muscle
		ATP is required for muscle relaxation

The basic unit of contraction in skeletal muscles is the ________.   

		myofibril
		sarcomere
		Z band
		fascicle
		myosin and actin

Answer 1

First question.

It's spasm. It's caused by a sudden involuntary muscle contraction and leads to a steady state. It's much painful.

Second question

All of the above is the answer. can maintain cross bridges even after death

will not relax after death without ATP until cross bridges deteriorate.

After death as ATP is not available myosin remains bound to the actin so cross bridge remains unbroken after death.

Third question.

Muscles use the skeleton as leverage points as they push against bones to produce body movement. This statement is false. Muscle tissue helps in motion. But it's not by using skeleton as leverage points

Fourth question.

It's sarcomere. Depending upon the change in sarcomere length the muscle contraction takes place. Sarcomere is the unit if contraction which contains the actin and myosin filaments.