What type of contraction is occurring here?

What is the name of the thin myofilaments in a muscle cell?

Contractions are generated by

The actin is represented by which letter?

Calcium:

What attaches the muscle to the bone?

What is a bundle of muscle fibers called?

When a muscle contracts, it _______.

This states that the muscle fibers shorten as the actin and myosin filaments pull on each other.

Tropomyosin covers the actin and prevents the myosin head from attaching to the actin (rope or strand shape).

What is A pointing to?

What is B pointing to?

What is C pointing to?

What is D pointing to?

What is E pointing to?

What is F pointing to?

The gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction is called:

Tiny chains of contractile units between two Z disks, which are aligned end to end

A neurotransmitter that stimulates skeletal muscles

The only energy source that can be used to directly power muscle activity

Point where the axon terminals of a nerve cell and the sarcolemma of a skeletal muscle join

The heads of the myosin myofilaments are called __ when they link the thick and the thin filament together.

Plasma membrane of a muscle cell

Specialized smooth endoplasmic reticulum that surrounds each myofibril, stores calcium, and releases it on demand.

Myosin protein is found in which part of a muscle cell?

Actin is a contractile protein found in which structure?

What is the function of calcium during a skeletal muscle contraction?

Which of the following refers to the muscle cell?

Which component is attached to the Z line?

What is released from the sarcoplasmic reticulum?

Which pathway produces 95% of the energy for muscles?

A single action potential causes a brief contraction followed by a relaxation in the muscle. This is called a single ___________________.

Identify A: Very brief delay between stimulus and contraction.

Identify B: Time when the muscle generates external tension. The force generated can overcome the load and cause movement.

Identify C: Time when tension declines to baseline. SR reabsorbs Ca²⁺, myosin releases actin, and tension decreases. Takes longer than contraction.

__________ _____________ occurs when a given set of cells is repeatedly stimulated without complete relaxation.

If repeated stimuli are given at a slower rate, then muscle fiber contractions grow stronger as they summate, but the relaxation between the contractions remains incomplete.

If repeated stimuli are applied at a fast rate, and no relaxation occurs between the stimuli, the muscle reaches maximum tension and a sustained contraction phase is obtained.

This type of muscle tissue is found only in the heart.

This type of muscle tissue is found in the walls of hollow organs such as the stomach.

Muscle tissue

Which type(s) of muscle tissue have visible striations?