Anatomy Chapter 6 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
term | definition |
excitability | capacity of skeletal muscle to respond to a stimulus |
extensibility | ability to be stretched |
elasticity | ability to recoil to original shape after being strected |
epimysium | each skeletal muscle surrounded by a connective tissue sheath called the |
contractility | ability of skeletal muscle to shorten with force |
fascia | connective tissue located outside the epimysium |
perimysium | loose connective tissue surrounding the facicle |
fibers | fasciculi are composed of single muscle cells |
endomysium | each fiber is surrounded by connective tissue sheath called |
myofibrils | a threadlike structure that extends from one end of the fiber to the other |
actin myofilaments | thin myofilaments |
actin myofilaments | resemble 2 minute strands of pearls twisted togetherr |
myosin myofilaments | thick myofilaments |
myosin myofilaments | resemble bundles of minute golf clubs |
motor neurons | nerve cells that carry action potentials to skeletal muscles |
motor unit | single motor neuron and all the skeletal muscle fibers it innervates |
presynaptic terminal | enlarged nerve terminal |
synaptic cleft | the space between the presynaptic terminal and the muscle cell |
postsynaptic terminal | muscle fiber |
sliding filaments mechanism | the sliding of actin myofilaments past myosin myofilaments during contraction |
muscle twitch | contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
threshold | muscle fiber will not respond to stimulus until that stimulus reaches this level called |
all or none response | muscle fiber will not respond to stimulus until that stimulus reaches this level called threshold, at which point the muscle fiber will contract maximally |
lag phase | time between application of a stimulus to a motor neuron and the beginning of a contraction |
contraction phase | time of contraction |
relaxation phase | time during which the muscle relaxes |
tetany | where the muscle remains contracted without relax |
recruitment | the increase in number of motor units being activated |
ATP | this is needed for energy muscle for muscle contraction |
anaerobic respiration | without oxygen |
aerobic oxygen | with oxygen |
muscle fatigue | when ATP is used during muscle contraction faster that it can be produced in the muscle cells |
isomeric | length of muscle does not change, but the amount of tension increases during the contraction process |
isotonic | the amount of tension produced by the muscle is constant during contraction but the length of the muscle changes |
muscle tension | muscle tone refers to constant tension produced by the muscles of the body for long periods of time |
fast twitch | contract quickly and fatigue quickly |
slow twitch | contract more slowly and are more resistant to fatigue |
occipitofrontalis | raises the eyebrows |
orbicularis oculi | closes the eyelids and causes “crows feet” wrinkles in the skin at the lateral corners of the eye. |
orbicularis oris | puckers the lips |
buccinator | flattens the cheeks |
orbicularis oris, buccinator | kissing muscles |
zygomaticus | smiling muscle |
levator labii superioris | sneering |
depressor anguli oris | frowning |
mastication | chewing |
4 pairs of mastication muscles | 2 pair of pterygoids, temporalis, and masseter. |
intrinsic | changes the shape of the tongue |
extrinsic | moves the tongue |
sternocleidomastoid | lateral neck muscle and prime mover |
Erector spinae | group of muscles on each side of the back. |
Erector spinae | Responsible for keeping the back straight and the body erect. |
most involved in breathing | Internal intercostals, External intercostals |
External intercostals | elevate the ribs during inspiration. |
Internal intercostals | contract during forced expiration. |
Diaphragm | accomplishes quiet breathing. |
Dome | shaped muscle. aids in breathing |
rectus abdominis | On each side of the linea alba is the |
Trapezius | rotates scapula |
Serratus anterior- | pulls scapula anteriorly |
Pectoralis major | adducts and flexes the arm |
Latissimus dorsi | medially rotates, adducts, and powerfully extends the arm. “Swimmer muscles” |
Deltoid | attaches the humerus to the scapula and clavicle, and is the major abductor of the upper limb |
Triceps brachii | extends forearm |
biceps brachii | flexes forearm |
brachialis | flexes forearm |
brachioradialis | flexes and supinates the forearm |
Retinaculum (bracelet) | strong band of fibrous connective tissue that covers the flexor and extensor tendons and holds them in place around the wrist so that they do not “bowstring” during muscle contraction. |
flexor capri | flexes the wrist |
extensor capri | extends the wrist |
flexor digitorum | flexes the fingers |
extensor digitorum | extends the fingers |
Gluteus maximus | buttocks |
Quadriceps femoris | extends the leg; anterior thigh muscles |
Sartorius | “tailors muscle”; flexes the thigh |
Hamstring muscles | posterior thigh muscles; flexes the leg and extends the thigh. |
Gastrocnemius and soleus | form the calf muscle. |
Created by:
carlymeadows23
Popular Anatomy sets