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muscle that has the ability to shorten with force. Contractility
dome-shaped muscle Diaphragm
contactility the ability of sketeal muscle to shorten with force
Excitability the capacity of skeletal muscle to resond to a stimulus
extensibility the ablility to be stretched
Elasticity ability to recoil to their original resting length after they have been stretched
epimysium each skeletal musclee is surrouned by a connective tissue sheath
flascia another connective tissue located outside the epimysium. It surrounds and separates muscles
Perimysium surrounded by loose connective tissue
fibers fasciculi are composed of single muscle cells
Endomysium each fiber is surrounded by a connective tissue sheath
myofibrils a threadlike structure that extends from one end of the fiber to the other
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres the sarcomere is the basic strustural and functional unity of the muscle
resting membrane potential the change of different across the membrane.
action potential the brief reversal back of the charge
motor neurons are nerve cells that carry action potentials to skeletal muscle fibers
neuromuscular junction axons enter the muscles and branch. each branxh that connects to the muscle forms
External intercostals elevate the ribs during inspiration
Internal intercostals contract during forced expiration.
Diaphragm accomplishes quiet breathing. Dome-shaped muscle. Aids in breathing.
linea alba This tendinous area of the abdominal wall
Tendinous inscriptions cross the rectus abdominis at three or more locations, causing the abdominal wall of a well-muscled person to appear segmented.
Trapezius rotates scapula
Serratus anterior pulls scapula anteriorly
pectoralis major and latissimus dorsi muscles The arm is attached to the thorax
Pectoralis major adducts and flexes the arm
Latissimus dorsi medially rotates, adducts, and powerfully extends the arm.
Deltoid attaches the humerus to the scapula and clavicle, and is the major abductor of the upper limb.
Triceps brachii extends the forearm. Occupies the posterior compartment of the arm.
Biceps brachii flexes the forearm. Occupies the anterior compartment of the arm.
Brachialis flexes forearm
Brachioradialis flexes and supinates the forearm.
Retinaculum 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 carpi flexes the wrist.
Extensor carpi extends the wrist
Flexor digitorum flexes the fingers
Extensor digitorum extends the fingers.
intrinsic hand muscles 19 hand muscles
Gluteus maximus buttocks. Contributes most of the mass of the buttocks
Gluteus medius hip muscle and common injection site.
Quadriceps femoris extends the leg; anterior thigh muscles
Sartorius flexes the thigh
Hamstring muscles flexes the leg and extends the thigh.
Gastrocnemius and soleus Flex the foot and toes.
peroneus The lateral muscles of the leg
intrinsic foot 20 muscles located within the foot
sliding filament mechanism the sliding of actin myofilaments past myosin myofilaments during contraction
muscle is a contraction oj an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers
threshold a muscle fiber will not resond to stimulus untl that stimulus reaches a level
all or none response which point the muscle fiber will contract maximally
lag phase the time between application os a stimulus to a motor meuron and the beginning of a contraction
contraction phase the time of contraction
relaxation phase the time during which the muscle relaxes
tetany where the muscle remains contracted without relaxing
recruitment the increase in the number of motor units being activated
APT(adenosine triphosphate) is needed for energy for muscle contraction
APT is produced in the mitochondria
APT is short lived and unstale. it degenerates to the more stable
APD plus phosphate
creatine phosphate when at rest they cant stockpile atp but they can store another high energy molecule
anaerobic respirartion without oxgyn
aerobic respiration with oxygen
oxygen debt is the amount of oxgyn needed in a chemical reaction to covert lactic acid to glueclose and to replenish the depletrd
muscle fatigue results when atp is used during muscle contractions faster than it can be produced
isometric the length of the muscle does not change
isotonic the amount pf tension produced by the muscle is constant during contractions
muscle tone muscle tone refers to constant tension produce by muscles of the body for long periods of tinme
fast twich muscle contracts quickley and fatigue quickly,
slow twich fibers contract more slowly and more resistant to fatigue.
origin the most stationary end of the muscle
insertion the end of the muscle undergoing the greastest movement
belly the portion of the muscle between the organ and the insertion
synergist muscles that work together to accomplish specific movements
antagonists muscles thst work in oppostioon to one another
prime mover among a group of synergists if one muscle plays the major role in accoplishing the ddesire of movement
Created by: dallaswedd



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