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Unit 3

MU BIO 5th/6th

QuestionAnswer
What is the ability of the skeletal muscle to shorten with force? Contractility
What is the capacity of skeletal muscle to respond to a stimulus? Excitability
What is the ability to be stretched? Extensibility
What is the ability to recoil to their original resting length after the have been stretched? Elasticity
What are the four major functional characteristics of muscles? Contractility, Excitability, Extensibility, Elasticity
A connective tissue sheath that surrounds skeletal muscles? Epimysium
A connective tissue located outside the epimysium. It surrounds and separates muscle. Fascia
A muscle is composed of numerous visible bundles called... Fasciculi (Fascicle)
Fasciculi are surrounded by loose connective tissue called... Perimysium
The fasciculi are composed of single muscle cells called... Fibers
Each fiber is surrounded by a connective tissue sheath called the... Endomysium
The cytoplasm of each fiber is filled with... Myofibrils
Thin myofilaments. They resemble 2 minute strands of pearls twisted together. Actin Myofilaments
Thick myofilaments. They resemble bundles of minute golf clubs. Myosin Myofilament
Actin and myosin myofilaments form highly ordered units called... Sarcomeres
The basic structural and functional unit of the muscle. Sacromere
Z line is an attachment site for... Actin
What kind of appearance is the arrangement of actin and myosin? Banded
The charge difference across the membrane is called... Resting Membrane Potential
The brief reversal back of the charge is called... Action Potential
What are nerve cells that carry action potentials to skeletal muscle fibers? Motor Neurons
Each branch that connects to a muscle forms what? Neuromuscular Junction or Synapse
What is a single motor neuron and all the skeletal muscle fibers it innervates? Motor Unit
The enlarged nerve terminal is the... Presynaptic Terminal
The space between the presynaptic terminal and the muscle cell is the... Synaptic Cleft
The muscle fiber between the presynaptic terminal and the muscle cell is the... Postsynaptic Terminal
Each presynaptic terminal contains (blank) that secretes a neurotransmitter called (blank). Synaptic Vesicles, Acetylcholine
The enzyme that breaks down acetylcholine is.... Acetylcholinesterase
The sliding of actin myofilaments past myosin myofilaments during contraction is called the... Sliding Filament Mechanism
A contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers is called... Muscle Twitch
A muscle fiber will not respond to stimulus until that stimulus reaches a level called the... Threshold
The phenomenon of the threshold when the muscle fibers contract maximally is called the... All-Or-None Response
The time between application of a stimulus to a motor neuron and the beginning of a contraction is the... Lag Phase
The time of contraction is the... Contraction Phase
The time when muscles relax is the... Relaxation Phase
This is where the muscle remains contracted without relaxing. Tetany
The increase in number of motor units being activated is called... Recruitment
What bands are actin? I and Z
Which bands are myosin? A, H, and M
Raise the eyebrows. Occipitofrontalis
Closes the eyelids and causes "crow feet" wrinkles in the skin at the lateral corners of the eye. Orbicularis Oculi
Puckers the lips. Orbicularis Oris
Flattens the cheeks. Buccinator
Smiling muscles. Zygomaticus
Sneering. Levator Labii Superioris
Frowning. Depressor Anguli Oris
Chewing. Mastication
Lateral neck muscle and prime mover. Rotates and abducts the head. Sternocleidomastoid
How many pairs of mastication muscles. 2 pair of pterygoids, temporalis, and masseter.
Change the shape of the tongue. Intrinsic Tongue Muscles
Move the tongue. Extrinsic Tongue Muscles
Lateral neck muscle and prime mover. Rotates and abducts the head. Sternocleidomastoid
Group of muscles on each side of the back. Responsible for keeping the back straight and the body erect. Erector Spinae
Muscles that move the thorax. Thoracic Muscles
Elevate the ribs during inspiration. External Intercostals
Contract during forced expiration. Internal Intercostals
Accomplishes quiet breathing. Dome-shaped muscle. Aids in breathing. Diaphragm
Rotates scapula. Trapezius
Pulls scapula anteriorly. Serratus Anterior
Adducts and flexes the arm. Pectoralis Major
Medially rotates, adducts, and powerfully extends the arm. "Swimmer muscles". Latissimus Dorsi
Attaches the humerus to the scapula and the 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
Flexes the wrist. Flexor Carpi
Extends the wrist. Extensor Carpi
Flexes the finger. Flexor Digitorum
Extends the fingers. Extensor Digitorum
Without oxygen. Anaerobic Respiration
With oxygen, Aerobic Respiration
Results when ATP is used during muscle contraction faster than it can be produced in the muscle cells. Muscle Fatigue
The amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells. Oxygen Debt
Equal distance. Isometric
Equal tension. Isotonic
The most stationary end of the muscle. Origin
The end of the muscle undergoing the greatest movement. Insertion
The portion of the muscle between the origin and the insertion. Belly
Muscles that work together to accomplish specific movements. Synergists
Muscles that work in opposition to one another. Antagonists
Among a group of synergists, if one muscle plays the major role in accomplishing the desired movement. Prime Mover
Created by: HunterDonahoe