NMS System Unit Review Honors

The structure that carries electrical messages away from a neuron’s cell body is called a(n)

• axon.

• vesicle.

• synapse.

• dendrite.

Why does a reflex arc result in a very quick response?

• because the brain senses danger

• because the reflex is voluntary

• because the motor neuron responds faster than any other

• because the impulse does not travel to the brain

Which type of neuron relays signals from the central nervous system to the muscles?

• sensory neuron

• interneuron

• motor neuron

• specialized support cell

Which part of this neuron carries messages to the cell body?

• axon

• dendrites

• nucleus

• terminals

The cartilage on the ends of long bones serves which of the following functions?

• Attaching the bones to muscles

• Connecting the bones to other bones

• Cushioning and resisting compression at joints

• Forming and storing red blood cells for the body

Which bone is part of your axial skeleton?

• thigh bone

• breast bone

• ankle bone

• finger bone

What is true of all joints?

• They occur where two bones meet.

• They provide limited movement.

• They include a ligament.

• They provide a place for muscle to attach.

Skeletal muscle is attached to bones by

• actin fibers.

• tendons.

• filaments.

• myofibrils.

What is the term that describes the unit of a muscle cell that contains all of the structures necessary to cause a contraction (basic contractile unit of a muscle)?

• sarcomere

• Ca2+ ion

• filament

• myofibril

Your appendicular skeleton is made up of the bones in your arms and

• ribs.

• spine.

• skull.

• legs.