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Muscular System

Chapter 9 Anatomy & Physiology

QuestionAnswer
The type of muscle that is only found in the heart Cardiac Muscle
this muscle consist of short, branching fibers that fit together in intercalated discs Cardiac Muscle
The type of muscle that is found in the digestive tract, blood vessels, bladder, airways, and uterus Smooth Muscle
The type of muscle that attaches bone and causes movement to the body Skeletal Muscle
A skeletal muscle cell is called a Muscle Fiber
A delicate connective tissue that covers each muscle fiber is called Endomysium
muscle fibers that are grouped in bundles are called Fascicles
A sheath of tougher connective tissue that encases the fascicles is called Perimysium
a layer of connective tissue that surrounds the muscle as a whole and binds all the muscle fibers together is called Epimysium
Connective tissue that surrounds the muscle outside the epimysium is called Fascia
this lies between muscles Deep Fascia
this resides just under the skin Superficial Fascia
Muscle fibers that merge with the periosteum of the bone, forming a strong attachment is called Direct Attachment
when the epimysium extends past the muscle as a tendon . the tendon then merges with the periosteum is called Indirect Attachment
the plasma membrane surrounding each muscle fiber is called a Sarcolemma
the cytoplasm of the a muscle cells is called Sarcoplasm
long protein bundles that fill the Sarcoplasm is called Myofibrils
the smooth endoplasmic reticulum of a muscle fiber that surrounds each myofibril is called Sarcoplasmic Reticulum
Myofibrils consists of even finer fibers called Myofilaments
thick myofilaments are made of a protein called Myosin
thin myofilaments consist of protein called Actin
A system of tubules that extend across the sarcoplasm is called Transverse Tubules
A plate or disc that serves as an anchor point for thin myofilaments is called Z-disc/ Z-line
the section between the z-discs is called a Sarcomere
the neuron and all the fibers is stimulates is called a Motor Unit
the minimum voltage needed to cause a muscle fiber to contract is called the Threshold
when a fiber receives a stimulus at or above threshold, it responds after a brief lag by quickly contracting and then relaxing is called Twitch
the phenomenon, in which each successive twitch contracts more forcefully the previous one is called Treppe
the condition of rapid contraction with only partial relaxation is called incomplete tetanus
if the impulses arrive so fast that the muscle cant relax at all between stimuli is called Complete tetanus
this refers to the end of the muscle that attaches to the more stationary bone Origin
the thick mid-section of the muscle is called the belly
the end of a muscle that attaches to the more movable bone is called Insertion
muscles that trigger movement is called Prime mover
muscles that assist in movement are called Synergists
muscles that balance movements are called Antagonists
this muscle raises the eyebrows when glancing upward or showing surprise Frontalis
A sphincter muscle that closes the eye when blinking or squinting Orbicularis Oculi
this muscle draws the mouth upward when laughing Zygomaticus
this muscle closes the mouth and purses the lips, such as when kissing Orbicularis oris
this muscle assists in smiling and blowing Buccinator
this muscle aids in closing the jaw Temporalis
this muscle actually closes the jaw Masseter
this muscle flexes the head Sternocleidomastoid
this muscle extends the head and flexes the head from side to side Trapezius
the muscles that lie superficially between ribs; elevates the ribs during inspiration External intercostals
enlarges the thorax to trigger inspiration Diaphragm
this muscle compresses the abdominal organs with aids in forceful expiration, vomiting, and defecation External Oblique
the aponeuroses of muscles forming the abdominal wall meet in the mid line of the abdomen, where they form a tough band of connective tissue called the Linea Alba
this muscle flexes the lumbar region of the spinal column to cause bending forward of the waist Rectus abdominis
this muscle compresses the contents of the abdomen Transverse Abdominis
this muscle stabilizes the spine and maintains posture, just like the external oblique muscles Internal Oblique
this muscle abducts, flexes, and rotates the arm Deltoid
this muscle flexes and adducts the upper arm, such as when climbing or hugging Pectoralis Major
this muscle drives all forward-reaching and pushing movements Serratus anterior
this muscle raises and lowers the shoulders Trapezius
this muscle adducts the humerus Latissimus dorsi
the four tendons that are connected to the scapula is called the rotator cuff
the muscle that is the prime mover when flexing the forearm is called Brachialis
the muscle that assists the brachialis when flexing the forearm Biceps Brachii
the prime mover when extending the forearm Triceps Brachii
helps the brachialis and the biceps brachii flex the forearm Brachioradialis
this muscle allows the arm to pronate Pronator muscles
this lies deep within the forearm near the elbow Supinator muscle
muscles that flex the wrist is called Flexors
this flexes the thigh and consists of the llicus and psoas major Lliopsoas
the longest muscle in the body is called the Sartorius
these muscles rotate and draw the thigh in toward the body Adductor muscles
the most powerful muscle in the body that is the prim mover for knee extension Quadriceps Femoris
a group of muscles that work to extend the thigh at the hip, flex the knee and rotate the leg is called Hamstring
this muscle abducts and rotates the thigh outward Gluteus medius
the bulkiest muscle in the body. located in the butt Gluteus Maximus
this muscle lies beneath the other two gluteal muscles Gluteus minimus
Created by: Leci81