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A&P Chapter 9 Muscles
Words to know for chapter 9 muscular system
19
Biology
Undergraduate 1
04/24/2011

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Term
Myoglobin
Definition

-Pigment in muscle cells that reduce muscles need for constant blood supply

 

-stores oxygen

Term
Hemoglobin
Definition
-Pigment found in red blood cells that transport oxygen into blood stream
Term
Threshold Stimulus
Definition
-Minimal stimulus needed to produce a muscle contraction
Term
Muscle Fatigue
Definition
-When muscle looses ability to contract
Term
Refractory period
Definition
-Immeditalely following contraction during which a muscle fiber cant respond
Term
Latent Period
Definition
-time between stimulus & responding contractions
Term
Twitch
Definition
-Single contraction of a muscle fiber
Term
What is peristalsis?
Definition
-wave like motion, transmission of pulses from cell to cell
Term
What is orgin & insertion?
Definition

Orgin- immovable end

Insertion- moveable end

Term
Prime mover?
Definition
-Responsible for producing a action
Term
Synergists?
Definition
-Assist prime mover
Term
Antagonists?
Definition
-Resist prime mover and can cause movement in opp. direction
Term
Neuromuscular junction
Definition
-Where axon & muscle fiber meet
Term
What is a motor neuron
Definition
-impulses from brain to body parts
Term
Motor end plate
Definition
-the flattened end of a motor neuron that transmits neural impulses to a muscle
Term
Synaptic Cleft
Definition
-The tiny space between two nerve cells across which the acetylcholine diffuses.
Term
Synaptic Vesicle
Definition
-store various neurotransmitters that are released at the synapse
Term
Neurotransmitter
Definition
-transmission of signals from one neuron to the next across synapses
Term
Motor unit
Definition
-all of the muscle cells that are controlled by a single motor neuron
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