Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
Anatomy ch.6 muscles
muscle flash cards
| 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 |
| Four major functional characteristics | contractility, excitability, extensibility, and elasticity |
| Each skeletal muscle is surrounded by a connective tissue sheath called the | epimysium. |
| __________ is another connective tissue located outside the epimysium. It surrounds and separates muscles. | Fascia |
| Myofibrils consist of 2 major kinds of protein fibers: | actin myofibrils and myosin myofilaments |
| thin myofilaments. they resemble 2 minute strands of pearls twisted together. | actin myofibrils |
| thick myofilaments. they resemble bundles of minute golf clubs. | myosin myofilaments |
| actin and myosin myofilaments form highly ordered units called ____________. | |
| each sarcomere extends from one ___ line to the other___ line. | z |
| are nerve cells that carry action potentials to skeletal muscle fibers. | motor neurons |
| a single motor neuron and all the skeletal muscle fibers it innervates are called a ___________. | motor unit |
| axons enter the muscles and branch. each branch that connects to the muscles forms a _______________, or _________ near the center of the cell | neuromuscular function, synapse |
| is a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers. | muscle twitch |
| the time between application of a stimulus to motor neuron and the beginning of a contraction is the ___________. | lag phase |
| the time of contraction is the ___________. | contraction phase |
| the time during which the muscle relaxes is the ______________. | relaxation phase |
| where the muscle remains contracted without relaxing . | tetany |
| the increase un number of motor units being activated is called_________. | recruitment |
| ATP (adenosine triphosphate) | |
| ATP is produced in ______________. | mitochondria |
| without oxygen | |
| with oxygen | aerobic respiration |
| the ___________is the amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish and depleted stores of creatine phosphate stores in muscle cell. | oxygen debt |
| results when ATP is used during muscle contraction faster than it can be produced in the muscle cells. | muscle fatigue |
| what are the two types of muscle contraction? | isometric and isotonic |
| (equal distance) the length of the muscle does not change, but the amount of tension increases during the contraction process. | isometric |
| (equal tension) the amount of tension produced by the muscle is constant during a contraction, but the length of the muscle changes. | isotonic |
| refers to constant tension produced by muscles of the body for long periods of time. Keeps head up and back straight. | muscle tone |
| constant quickly and fatigue quickly. Well adapted to perform anaerobic metabolism. | fast twitch fibers |
| contract more slowly and are more resistant to fatigue. they are better suited for aerobic metabolism. | slow twitch fibers |
| origin | |
| the ___________ is the end of the muscle undergoing the greatest movement. | insertion |
| the portion of the muscle between the origin and the insertion is the _________. | belly |
| muscles that work together to accomplish specific movements are called ______________. | synergists |
| muscles that work in opposition to one another are called ______________. | antagonist |
| among a group of synergists, if one muscle plays the major role in accomplishing the desired movement, it is the __________________. | prime mover |
| occipitofrontalis | raises the eyebrows |
| oribicularis oculi | closes the eyelids and causes "crows feet" wrinkles in he skin at the lateral corners of the eye. |
| orbicularis oris | puckers the lips. |
| buccinator | flattens the cheeks. Trumpeter's muscle. Obricularis oris and buccinator are the kissing muscles. |
| zygomaticus | smiling muscle |
| levator labii superioris | sneering |
| depressor anguli oris | frowning |
| mastication | chewing |
| 4 pairs of mastication muscles | 2 pair of pteryoids, temporalis, ad masseter. |
| intrinsic tongue muscle | change the shape of tongue |
| move the tongue | |
| lateral neck muscle and prime mover. rotates and abducts the head | sternocleidomastoid |
| muscles that move thorax | thoracic muscles |
| rotates scapula | trapezius |
| pulls scapula anteriorly | serratus anterior |
| the arm is attached to the ___________________________________-. | pectoralis ajor and lastissmus dorsi muscles |
| adducts and flexes the arm | pectoralis major |
| medically rotates, adducts, and powerfully extends the arm. "Swimmer muscles" | latissimus dorsi |
| attaches the humerus to the scapula and clavicle, and is the major abductor of the upper limb | deltoid |
| extends the forearm. occupies the posterior compartment of the arm. | triceps brachii |
| flexes the forearm. occupies the anterior compartment of the arm. | biceps brachii |
| flexes forearm. | brachialis |
| flexes and supinates the forearm. | brachioradialis |
| strong band of fibrous connective tissue that covers the flexor and extensor tendons and holds them in place around the wrist so hat they do not "bowstring" during muscle contraction | retinaculum |
| flexes the wrist. | flexor carpi |
| extends the wrist. | extensor carpi |
| flexes the fingers. | flexor digitorum |
| extends the fingers. | extensor digitorum |
| buttocks | gluteus maximus |
| extends the leg: anterior thigh muscles | quadriceps femoris |
| "tailors muscle" flexes the thigh | sartorius |
| posterior to the thigh muscle; flexes the leg and extends the thigh | hamstring muscle |
| form the calf muscle. they join to form the calcaneal tendon (achilles tendon). flex the foot and toes. | gastrocnemius and soleus |
| 20 muscles located within the foot, called the _________muscles flex extend, abduct, and adduct the toes. | intrinsic foot |
| group of muscles on each side of the back. responsible for keeping the back straight and the body erect. | erector spinae |
| most involved in breathing | external and internal intercostls |
| how many muscles are in the human body? | 700 |
Created by:
kaylen.asbury
Popular Anatomy sets