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chapter 6 anatomy

Skeletal muscle Attached to bones
Cardiac muscle Walls of the heart
Smooth muscle Mostly in the hollow visceral organs
Deep to the dermis Hypodermis
Epidermis Outer layer
Nerve fiber Axon
Irritability Ability to receive and responds to stimulus
Anerobic Without oxygen
Aerobic With oxygen
Aerobic or endurance Jogging biking . Result in strong result of more flexible muscles . More resistance to fatigue
Contractility The ability of skeletal muscle shortens force
Excitability The capacity of skeletal muscle to respond to a stimulus
Extensibility The ability to be stretched
Elasticity Ability to recoil to the original resting length after they have been stretched
Epimysium Connective tissue Sheath that surrounds the skeletal muscle
Fascia Connective tissue located outside the Epimysium
Perimysium Loose connective tissue that surrounds
Muscle cells Muscle fibers
Myofibrils Threadlike structure that extends from one end of the Farber to another
Actin myofilaments Thin
Myosin myofilaments Thick
Actin and myosin myofilaments form highly ordered units Sarcomeres
Motor nuerons Nerve cells that carry action potential to skeletal muscle fibers
Nueromuscular junction Synapse
Neurotransmitter Acetylcholine
Muscle fiber Postsynaptic terminal
Muscle cell Synaptic cleft
The brief reversal back of the charge is called Action potential
The charge difference across the membrane is called Resting membrane potential
Muscle twitch The contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers
Phenomenon All or none response
A muscle fiber will not respond to stimulus until that stimulus reaches a level called threshhold
Lag phase The beginning of a contraction
Contraction phase The time of the contraction
Relaxation phase The time that the muscle relaxes
Tetany Where the muscle reminds contracted without relaxing
The increase in number of motor units being activated is called recriutment
ATP Is needed for energy for muscle contraction
ATP Is produced in the mitochondria
ATP Is short-lived and unstable
Aerobic With O
Anaerobic Without O
Muscle fatigue Get tired
Isometric Tension changes length same
Isotonic Tension same length changes
Muscle tone Constant tension
Fast twitch Light meant
Slow twitch Dark meat
Oxygen debt Trying to get o back
Orgin Head
Insertion End
Belly Between insertion and head
Muscles that work together Synergist
Muscles that work against each other Antagonists
Plays a major role Prime moverv
Gluteus Maximus Buttocks
Flexor carpi Flexes the wrist
Extensor carpi Extends the wrist
Extensor digitorum Extends the fingers
Flexor digitorum Flexes the fingers
Retinaculum Bracelet
Tricep Extends 4 arm
Biceps Flex the forarn
Brachialis Flexes 4 arm
Trapezius Rotates scapula
Sereatus Pulls scapula
Mastication Chewing
Sternocliedomastoid Neck
Intrinsic Change shape
Extrinsic Move tongue
Zygomaticus Smiling
Buccinator Flattens checks
Occipitofrontalis Raises the eyebrows
Orbicularis oculi Closes eyelids
Orbicularis oris Puckers the lips
Created by: ben.romans