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AP MUSCLES
| Question | Answer |
|---|---|
| the ability of skeletal muscle to shorten with force | contractility |
| the capacity of skeletal muscle to respond to a stimulus | excitability |
| the ability to be stretched | extensibility |
| ability to recoil to their original resting length after they have been stretched | elasticity |
| muscles help to produce heat essential for maintenance of normal body temp. | true |
| the connective tissue sheath that each skeletal muscle is surrounded by | epimysium |
| a connective tissue located outside the epimysium/ it surrounds and separates muscles | fascia |
| a muscle composed of numerous visible bundles | fasciculi/ fascicle |
| fasciculi are surrounded by a loose connective tissue called the | perimysium |
| the fasciculi are composed of single muscle cells called | fibers |
| each muscle fiber is a single cylindrical cell containing several... | nuclei |
| each fiber is surrounded by a connective tissue sheath called the | endomysium |
| myofibrils consist of 2 major kinds of protein fibers | actin myofilaments myosin myofilaments |
| thin myofilaments. they resemble 2 minute strands of pearls twisted together | actin myofilaments |
| thick myofilaments. they resemble bundles of minute golf clubs | myosin myofilaments |
| highly ordered units formed by actin & myosin filaments | sarcomeres |
| the basic structural and functional unit of the muscle | sarcomeres |
| each sarcomere extends from one _______ to another | z line (disc) |
| Each z line is an attachment site for ... | actin |
| the arrangement of these things give a band appearances | actin & myosin |
| the darker band that extends the length of the myosin | A band |
| the light area which consist only of myosin | H zone |
| what are the myosin myofilaments are anchored by a staining band called the | M line |
| outside of the cell membranes compared to the inside. | positively charged |
| the inside of the cell membrane is | negatively charged |
| the charge difference across the membrane is called the | resting membrane potential |
| stimulation of the muscle cell creates | a change in cgarecteristic |
| the brief reversal back of the charge is called | action potential |
| nerve cells that carry action potentials to skeletal muscle fibers | Motor Neurons |
| axons enter the muscle and branch. each branch that connects to a muscle | Neuromuscular junction; or synapse if its near the center of the cell |
| single motor neuron and all the skeletal muscle fibers it innervates are called | Motor unit |
| an enlarged nerve terminal resting in an indentation of the muscle cell membrane | neuromuscular junction |
| the enlarged nerve terminal is called the | Presynaptic Terminal |
| the space between the presynaptic terminal and the muscle cell is the __________ & the muscle fiber is ___________ | synaptic cleft ; Postsynaptic terminal |
| each terminal contains ________ that secrete a neurotransmitter called | acetylcholine |
| acetylcholine released into the synaptic cleft between the neuron and muscle cell is rapidly broken down by an enzyme | acetylcholinesterase |
Created by:
tanna.vay
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