A&P chapter 10 pt. 1

Place the organizational level of muscle tissue in order, beginning with the entire muscle and ending with the smallest component.

1). Muscle 2). Fascicle 3). Muscle Fiber 4). Myofibril 5). Myofilament

The area of the muscle fiber where the actin and myosin myofilaments overlap is the

A band

proteins of thin filaments are:

Actin and Troponin

During contraction, the actin myofilaments slide toward the

H zone

Which of the following best describes the role of Ca2+ in muscle contraction?

It binds to troponin, moving tropomyosin, so that myosin heads can bind to actin.

-The distance from one Z disk to the next Z disk is called a(n) -The contractile unit of a myofibril is called the

Sarcomere

All the muscle fibers under the control of a single motor axon are referred to as

a motor unit

The ability of muscle cells to shorten is called _______, a property that allows muscle cells to cause body movement.

contractility

The specialized region of the sarcolemma that has folds and indentations to increase the membrane surface area covered by the synaptic knob is the

motor end plate.

An action potential causes calcium ions to diffuse from the ________ into the ________.

sarcoplasmic reticulum; sarcoplasm