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Chapter 6 Muscles

Brandi Gibson

Muscle Cells Muscle fibers
The ability to to be stretched Extensibility
What surrounds each skeletal muscle? epimysium
What is fascia? Another connective tissue located outside the epimysium.
What are Motor neurons? nerve cells that carry action potentials to skeletal muscle fibers.
Each branch that connects to the muscle forms what? Neuromusclular junction
What does each preynaptic terminal contain? synaptic vesicles
Muscle twitch a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers
A muscle fiber will not respond to stimulus until that stimulus reaches a level called? Threshold
Contractility the ability of skeletal muscles to shorten with force
What occurs in the absence of oxygen? Anaerobic Respiration
What kind of Muscle fibers fatigue quickly? Fast twitch fibers
Slow Twitch fibers are? Muscle fibers that are resistant to fatigue
What are muscles that work against each other called? Antagonists
Synergists are what? Muscles that work together
Two types of tongue muscles Intringic and Extrinsic
What does the levator superioris enable us to do? Sneer
Occipitofrontals allow us to what? Rise the eyebrows
Buccinator does what? Flattens the cheeks
Mastication does what? Allows us to chew
Zygomaticus lets us? Smile
the whole muscle is surrounded by 2 layers of tissue called what? Fascia and epimysium
What is the condition in which the muscle remains contracted without relaxing is called? Tetany
What is a muscle twitch? A contraction of an entire muscle in response to stimulus
Aerobic respiration occurs when? In the presence of oxygen
Which tongue muscle changes the shape of the tongue? Intrinsic
What muscle closes the eyelid? Orbiculoris oculi
Triceps brachii extends the forearm
Where is the latissimus dorsi? the back muscles
What does the rotator cuff do? Attaches the humerus to the scapula
Flexor carpi flexes wrist
Extensor carpi extends wrist
Rentinaculum (bracelet) covers flexors and extensors and holds them in place
How many hand muscles are there between the metacarpals? 19
Pectoralis major chest muscle, adducts and flexes the arm
Linea alba extends from the sternum to the navel to the pubis
What does the Gluteus maximus control? Buttocks/It rotates the thigh
What is a common injection site? The Gluteus meduis
Sternocleioidmastoid? Prime mover lateral neck muscle-rotates and abductes the head
External Intercostals elevates ribs during inspiration
Internal Intercostals Contracts during forced expiration
Diaphram Is used during quiet breathing
Orbicularis oris puckers the lips
Depresser anguli oris frowning
What is the beginning of a contraction called? Lag phase
The increase in number of motor units being activated is called? Recruitment
A single motor neuron and all the skeletal muscle fibers it innervates are called? Motor unit
Excitability the capacity of skeletal muscle to respond to a stimulus
Elasticity ability to recoil to their original resting length after they have been stretched
Each muscle fiber is a single cylindrical cell containing several what? Nuclei
myofibrils? threadlike structure that extends from one end of the fiber to the other
Why does muscles produce heat? its essential for maintenance of normal body temperature
Myofibrils consists of what 2 kinds of proteins? actin myofilameants and myosin myofilaments
Actin and myosin myofilaments form highly ordered units called what? sarcomeres
Flexor digitorum flexes fingers
extensor digitorum extends fingers
How many muscles are in the foot? 20 and they are called intransit
Created by: Brandibejeweled



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