Muscle Flashcards
Skeletal muscle
Striated muscles
voluntary Movement of skeletal muscle moves the body by pulling on bones
Cardiac muscle
Specialized striated muscle found in the heart involuntary pumping of blood throughout the body
smooth muscles
Non-striated muscle found in hollow organs involuntary movement of substances
Muscular system and function
Composed of skeletal muscle
Movement posture and joint stability control of body openings Thermal regulation glycemic control
Circulatory system
Cardiac muscle is only found in the heart
What is skeletal muscle tissue consist of
Myocytes and connective tissue
Characteristics of skeletal muscle tissue
Contractility – contains myofilaments that allow to contract
Excitability- nerve cells innovate muscle tissue in order to know when to contract
 extensibility - stretch to certain extent without tearing
Elasticity- can recoil back to resting length
Myocyte
Skeletal muscle cell long cylinder cell with striations
Myofibrils
 cylinder bundles of contractile proteins
Made up of myofilaments
Elastic Filaments
Compose of Titin
Interesting filaments in place restricts overstretching
What filaments are light and dark bands
Light equals Iband
Dark equals a band
Sarcomere
Function unit of myocyte consist of segments of myofribil in between 2Z lines
Smallest to largest skeletal muscle
Myofilaments, myofibril, Muscle fiber, fascicle, muscle
 Endomysium
Then sleeve of connective tissue that in cases each myocyte
Perimysium
Sleeve of connective tissue around each fascicle
Epimysium
Diverse layer of connective tissue that wraps around each muscle
Fascia
Connected tissue that holds together functionally related muscle
Tendon
Connected tissue that firmly attaches muscle to bone
Endo, Peri, epimysium All join to form a tendon on the muscle end
 tendon attaches periosteum Of bone on the bone end
Aponeurosis
Wide broad tendon
Wild tendons attach muscle to specific point on a bone aponeurosis provide attachment over broad area
Cutting off nerve supply results in
Muscle paralysis
Somatic motor neuron
Nerve cells that innervate skeletal muscle
 Fibers can travel long distances to innovate individual myocytes
Muscle receives about
1/4 of the bodies blood supplies
During exercise muscles can require up to
3/4 of the bodies blood supply
Blood capillaries branch extensively through
Connective tissue of muscle
Endomysium perimysium epimysium
