1. A(n) ___________ is the contractile unit of skeletal muscle.
A) myosin filament
B) myofibril
C) actin filament
D) sarcomere

2. The lower leg can only move in one plane. This is due to _____________ located at the knee.
A) a ball and socket joint
B) cartilage
C) a pivot joint
D) a hinge joint

3. Which of the following statements is TRUE?
A) The term neurotransmitter is another way to describe an action potential.
B) Synapses transmit information using only neurotransmitters.
C) In the human body the heart is regulated using neurotransmitters.
D) A synapse relays information between a neuron and a receiving cell.

4. An example of a natural pain killer is (are)
A) dopamine
B) endorphins
C) epinephrine
D) serotonin

5. The part of a neuron that carries nerve impulses toward the cell body is called
A) a dendrite
B) an axon
C) supporting cell
D) a neurotransmitter

6. According to the sliding filament model for muscle contraction _____________ ions move inside the muscle cell to initiate muscle contraction.
A) chloride
B) potassium
C) calcium
D) sodium

7. An acquaintance is admitted to hospital suffering from an abnormally low body temperature, a loss of appetite and extreme thirst. A brain scan shows a tumor located in the
A) cerebrum
B) medulla oblongata
C) hypothalamus
D) cerebellum

8. Neurons at rest have _____ ions on the outside of the membrane and _____ ions to the inside of the membrane.
A) positive; negative
B) negative; positive
C) positive; positive
D) negative; negative

9. A motor neuron must receive a signal from the _______________ before muscle contraction begins.
A) the sympathetic division of the peripheral system
B) the parasympathetic division of the peripheral system
C) the somatic nervous system
D) central nervous system

10. Which part of the nervous system is associated with the "fight or flight" response?
A) the sympathetic division of the peripheral system
B) the parasympathetic division of the peripheral system
C) central nervous system
D) the somatic nervous system