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BIO141

Final Exam

QuestionAnswer
What is not a structural feature of a nearuon? synaptic cleft
The part of a neuron that conducts impulses away from its cell body is called a(n) axon
If one incoming impulse causes several outgoing nerve impulses, we know that there is a: diverging circuit
The point at which an impulse from one nerve cell is communicated to another nerve cell is the: synapse
The role of acetylcholinesterase is to: destroy ACh a brief period after its release by the axonal endings.
Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect Temporal summation
Stimulation of a postsynaptic neuron by many terminals at the same time. Spatial summation
An insufficient stimulus Subthreshold stiumulus
Any stimulus below this intensity will result in no response in a neuron. Threshold stimulus
TorF The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place. FALSE
TorF Reflexes are rapid, automatic responses to stimuli. TRUE
Efferent nerve fibers may be described as motor nerve fibers. TRUE
Saltatory conduction occurs because of the presence of NaCl (salt) around the neuron. FALSE
Neurotransmitters are releases at the _____. Axonal terminal
The rough ER of the cell. ______ Nissl bodies
Conducts impulses toward the nerve cell body. ______ Dendrites
Conducts impulses away from the nerve cell body. ___________ Axon
Period during which the neuron cannot respond to a second stimulus, no matter how strong. __________ Absolute refractory period
The interior of the cell becomes less negative due to an influx of sodium ions. _________ Depolarization
The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. _________ Repolariation
Called a nerve impulse when transmitted. __________ Action Potential
An exceptionally strong stimulus can trigger a response. ______ Relative refractory period.
TorF Movement of the thigh are accomplished by muscles anchored to the pelvic girdle. TRUE
TorF The insertion of the biceps brachii is on the radius. TRUE
TorF The chewing muscle covering the ramus of the mandible is the buccinator. FALSE
TorF A prime mover of the arm that acts in adduction would be the deltoid. FALSE
TorF The soleus is a synergist of the gastrocnemius used in plantar flexion. TRUE
TorF Muscles that help to maintain posture are often called synergist. FALSE
TorF In order to propel food down the esophagus, the pharyngeal constrictor muscles would be use. TRUE
TorF Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle. FALSE
TorF The arrangement of a muscle's fascicles determines its range of motion and power. TRUE
TorF Muscle power does not depend on the direction of the fascicles. TRUE
TorF The calcaneal tendon (Achilles tendon) is the largest, strongest tendon in the body. TRUE
TorF A pair of tweezers is a good example of a second-class lever. FALSE
TorF Both first- and second-class levers operated at a mechanical disadvantage. FALSE
TorF Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same. FALSE
TorF Muscles are only able to pull, they never push. TRUE
TorF The anconeus muscle flexes the knee and stabilizes the patella. FALSE
Muscle that opposes and reverses the action of another muscle. _________ Antagonist
Muscle that stabilizes the origin of another muscle _______ Fixator
Muscle that is primarily responsible for bringing about a particular movement. _______ Agonist
Muscle that aids another by promoting the same movement. ________ Synergist
TorF The force of muscle contraction is controlled by multiple motor unit summation or recruitment. TRUE
TorF Eccentric contractions are much more forceful than concentric contractions. TRUE
TorF A nerve cell and all the muscle cells that is stimulates are referred to as a motor end plate. FALSE
TorF Peristalsis is characteristic of smooth muscle. TRUE
TorF A contraction in which the muscle does not shorten but its tension increases is called isometric TRUE
TorF During isotonic contraction, the heavier the load, the faster the velocity of contraction. FALSE
TorF During isometric contraction, the energy used appears as movement. FALSE
TorF One of the important functions of skeletal muscle is production of heat. TRUE
TorF Oxygen debt refers to the oxygen required to make creatine phosphate. FALSE
TorF Muscle contraction will always promote movement of body parts regardless of how they are attached. FALSE
TorF Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments. TRUE
TorF Whereas muscle cells are electronically coupled, smooth muscle cells appear to be chemically couple by gap junctions. FALSE
TorF Single-unit smooth muscle is found in the intestines. TRUE
TorF A resting potential is caused by a difference in the concentration of certain ions inside and outside the cell. TRUE
TorF The effect of the nurotransmiter on the muscle cell membrane is to modify its permeability properties temporarily. TRUE
TorF When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length. TRUE
TorF The more slowly a skeletal muscle is stimulated, the greater its exerted force becomes. FALSE
Created by: Tiffany Fulton Garmon Tiffany Fulton Garmon on 2009-12-08



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