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Muscles Quiz1

The muscles of the body

QuestionAnswer
Contractility Ability of skeletal muscle to shorten with force.
Excitability Caoacityof skeletal muscle to respond to a stimulus.
Four Characteristics of skeletal muscles Contractility,excitability,extensibility, elasicity
Connective tissue located outside the epimysium? Fascia
connective tissue sheath surrounding the skeletal muscle? epimysium
fasciculi are composed of? single muscle cells called fibers
muscle fasciculi are surrounded by? lose connective tissue called perimysium
what occurs in the absence of oxygen? anerobic respiration
muscle fibers that fatigue quickly fast twitch
muscle fibers that are resistant to fatigue slow twitch
what raises the eyebrows capiton frontalis
two types of tongue muscles interior, exterior
what closes the eyelids orbicularis occuli
what is actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
what is sarcomeres basic structural and functional unity of the muscle.
Erector spinae group of muscles on each side of the back.
what is the erector spinae responsible for for keeping the back straight and the body erect
Thoracic Muscles muscles that move the thorax
Leg Movements Quadriceps femoris & Sartorius
Sartorius “tailors muscle”; flexes the thigh
Quadriceps femoris extends the leg; anterior thigh muscles
Hamstring muscles flexes the leg and extends the thigh
Gastrocnemius and soleus form what calf muscles
Flexor carpi flexes the wrist
Extensor carpi extends the wrist
Flexor digitorum flexes the fingers
Extensor digitorum extends the fingers
Triceps brachii extends the forearm. Occupies the posterior compartment of the arm
BEGINING OF A CONTRACTION lag phase
time of contraction contraction phase
time when muscle relaxes relaxation phase
tetany muscle remains contracted without relaxing
where is ATP produced mitochondria
when ATP is used faster than it is produced muscle fatigue
anaerobic respiration without oxygen
aerobic respiration with oxygen
muscle fatigue when ATP is being used faster than it is produced
isometric length stays the same tention increases
isotonic amont of tention is constantduring contraction
muscle tone constant tention produced by musles of the body for long periods of time
origin most stationary end of the muscle
insertion end of the muscle undergoing greatest movemnt
part of muscle between the origin and the insertion is called? belly
each sarcomere extends from what? Z line
enlarged nerve terminal presynaptic terminal
muscles that work together to acomplish speccificmovements are called synergists
muscles that work in opposition of eachother are called antagonists
Trapezius rotates scalpula
serratus anterior pulls scapula anteriorly
arm is attached to the? thorax
pectoralis major adducts and flexes arm
"swimmer muscles" latissimus dorsi
deltoid attaches the humerous to the scalpula and clavical
gluteus maximus buttocks
gluteus medius hip muscle
common injection site gludeus medius
quadriceps femoris extends the leg
sartorius flexes thigh
extends thigh hamstring
gastronemius and soleus form the calf muscle
lateral muscle of the leg peronous
20 muscles located in the foot intrinsic foot
prime mover one who plays a major role in accomplishing the desired movement
two major kind of protin fibers actin and myosin
resting membrane potential charge difference across membranes
action potential the breif reversal back of charge
synaptic vesicles secrete a neurotransmitter
acetylcholine neurotransmitter
synaptic cleft muscle cell
motor unit form single muscle
motor neurons nerve cells that carry actin potentials
all or none response reaches threshold or doesnt
broken down by enzymes acetylcholinesterase
A band extends the length of ? myosin
Created by: sarahnapier4