A&P eam 2

The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur?

Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate (junctional folds of the sarcolemma) and sodium enters the cell.

Which of the following is responsible for preventing a muscle from contracting?

Calcium ions are removed from the sarcoplasm by active transport.

Which of the following is NOT a role of ATP in muscle contraction?

Exposing myosin binding sites on actin

In a neuromuscular junction, synaptic vesicles in the motor neuron contain which neurotransmitter?

acetylcholine (ACh)

What is covered by the endomysium?

an individual muscle cell

Two or more bones meet at a location called a(n) ________.

articulation (joint)

Which of these terms refers to the shape of a muscle?

deltoid

Which layer of connective tissue surrounds each skeletal muscle fiber?

endomysium

What means of membrane transport is used to release the neurotransmitter into the synaptic cleft?

exocytosis

Which of these characteristics applies only to cardiac muscle tissue?

intercalated discs

What term describes the rotation of a bone around its longitudinal axis?

rotation

The plasma membrane of a skeletal muscle cell is called the ________.

sarcolemma

What organelle wraps and surrounds the myofibril and stores calcium?

sarcoplasmic reticulum

How is acetylcholine (ACh) removed from the synaptic cleft?

simple diffusion away from the synaptic cleft and acetylcholinesterase (AChE; an enzyme)

Which of these bones is part of the axial skeleton?

sternum

What term refers to a muscle that aids another muscle by producing the same the movement or reducing undesirable movements?

synergist

The action potential on the muscle cell leads to contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cell?

terminal cisterns (cisternae) of the sarcoplasmic reticulum

A muscle inserts on which of the following?

the bone that moves when the muscle contracts

A sarcomere is ________.

the contractile unit between two Z discs

When an action potential arrives at the axon terminal of a motor neuron, which ion channels open?

voltage-gated calcium channels