Muscular System Review

The synaptic cleft and sarcolemma also contain

acetylcholinesterase, which breaks down____?

• acH

• ACh

• AhC

• AHc

What happens when a neuron stimulates a muscle fiber?

• Contraction occurs

• Calcium ions release

• Troponin returns to its original position

• Calcium ions detach from troponin

Skeletal muscle fibers only contract under the

control of the ___?

• Endocrine System

• Nervous System

• Digestive System

• Cardiovasuclar System

Communication between the nervous system

and skeletal muscle fiber occurs at the ___?

• Neuromuscular Junction

• Myoneural Junction

• Synaptic Terminal

• Synaptic Cleft

What is the first step to when a neuron stimulates a muscle fibers?

• Appearance of an action potential in the

  sarcolemma. The influx of sodium ions creates an

  action potential in the sarcolemma at the edges of

  the motor end plate. This impulse travels along

  each of the t-tubules.

• When the impulse reaches the synaptic terminal, permeability changes in the membrane

  trigger exocytosis of ACh into the synaptic cleft. Exocytosis is achieved when vesicles in the

  synaptic terminal fuse with the membrane of the neuron.

• return to initial state. As the action

  potential is sweeping across the sarcolemma, ACh is being broken down by AChE. As the ACh

  breaksdown, some of it will be reabsorbed by the synaptic terminal and used to resynthesize ACh for future action potentials.

• The arrival of the action potential. The

  stimulus of ACh release is the arrival of an

  electrical impulse, action potential.

Cardiac muscle cells are also known as___?

• Cardiocytes

• Myofibrils

• Sarcomeres

• Myoglobin

The presence of the aligned sarcomeres

gives cardiac muscle tissue a ___?

• Skeletal look

• Smooth look

• Cardiac look

• Striated look

Cardiac muscle cell contraction lasts __ times longer

than contractions of skeletal muscle fibers.

• 13

• 15

• 10

• 5

Cardiac muscle tissue typically has ___ nucleus.

• Two

• One

• None

• Three

Where is cardiac muscle tissue found?

• Liver

• Kidneys

• Intestines

• Heart