Question

68) The insular lobe of the brain performs _____________ functions.

A) vision perception            B) speech            C) gustatory            D) higher executive/decision

70) A neurotransmitter, _________________, is the main chemical signal found at a neuromuscular junction.

A) dopamine               B) calcium               C) acetylcholine               D) acetylcholinesterase

73) The most powerful muscle in the body is the ________.

A) quadriceps femoris        B) rectus abdominis        C) gastrocnemius        D) gluteus maximus

78) The signal on the membrane of a neuron’s dendrites and cell body is called a(n) ________________.

A) action potential            B) neurotransmitter            C) graded potential            D) ligand

79) Isotonic contraction describes a muscle _____________ and _______________.

A) contracting; shortening               B) not contracting; shortening

C) not contracting; not shortening               D) contracting; not shortening

81) If ____________ and _____________ are absent or depleted, there will be no muscle contraction.

A) calcium; dopamine               B) acetylcholine; acetylcholinesterase    

C) ATP; acetylcholinesterase               D) calcium; ATP

83) Muscles with a very high stimulus frequency that reach a maximum tension are described as being in a _______________ state.

A) sub-threshold               B) fused (complete) tetanus               C) fused (incomplete) tetanus               D) twitch

84) A constant, slightly contracted state of all muscles is called muscle ______________.

A) tone               B) twitch               C) summation               D) relaxation

91) The neurotransmitter concentration in the synaptic cleft must be tightly regulated for neurons to function properly. Which of the following glial cells is most responsible for this regulation?

A) microglia             B) astrocytes             C) Schwann cells             D) oligodendrocytes

93) Saltatory conduction of an action potential is made possible by ________.

A) the myelin sheath                B) large nerve fibers

C) diphasic impulses                D) erratic transmission of nerve impulses

Answer 1