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IbarraRobertoMuscular.PDF Period 1 (Muscle Tissues Characteristics :star:,…
IbarraRobertoMuscular.PDF Period 1
Muscle Tissues Characteristics :star:
Contractility: shortening when stimulated= muscles different from other tissues
Excitabiity: to receive and too respond a stimulus by changing the membrane potential
Extensibility: to stretch or to extend. Can be stretched when relaxed
Elasticity: muscle cells recoil its regular length after a stretch/pull
Muscular System Functions :star:
Stabalize Joints: during movement, muscles pull on bones in order to cause movement to strengthen and eventually stabalize joints
Maintain Posturre: muscles face gravity in order to maintain a posture and become always functional
Generate Heat: as muscles contrract they genertate heat to maintain body temperature regulated
Produce movement: th skeletal muscles help with the locomotion meanwhle the cardiac muscles help supply blood which are carriers of oxygen to control respiration. Smooth muscles help through the organs to slide substances
Sliding Filament Theory (contraction) :star:
The nervous system sends stsimulations to the muscle fibers that will contact the myosin heads to slide and attach to the actin proteins
The sarcoplsmic Reticulum surrounds the myofibril and contains calcium ions that are the causes of contractions
T Tubules ensure that every musclle fiber contracts
In contractions, lines or filaments shorten. The Z line and I bands shorten and the H zone disappears
Structure and Organization of Skeletal Tissue :star:
Muscle: Consists of muscle cells, connective tissue,and is covered by the epimysium
Fascicles: part of the muscle that is surrounded by the perimysium
Muscle fiber (Cell): surrounded by endomysium and is multinucleated
Myofibrils are composed of sarcomeres and arranged myofibrils
Sarcomere: compsed of myofilaments
Myofilaments: thick and thin in which the thick have myosin and the thin have actin
Muscle Names, Location, Function :star:
Head: Temporalis, Msseter/ Facial: Epicranius, Orbicularis oculi, Zygomaticus, orbicularis oris
Leg: Fibularis longus, Gastrocnemius, soleus
Thigh: Satorius, abductor longus, gracilis, hamstrings, rectus femorus, illiotibial tract
Shoulder: Deltoid, teres major, trapezius,
Arm: triceps brachiil, biceps brachil, brachialis
Types of Muscle Tissue :star:
Skeletal Muscle Tissue
longest muscle fibers with striations and is voluntary
-overall mobility and has fast contractions
Cardiac Muscle Tissue
only in the heart and is striated
it is involuntary: contracts without stimulus
Smooth Muscle Tissue
found in visceral organs to force fluids through body
has enlongated cells, no striations and is involuntary
Structure of a Sarcomere :star:
Sarcomeres have two myofilaments thick(myosin) and thin (actin) partially responsible for the contraction.
The Mline vertically runs down the middle of the myofilaments
At the edges the of the sarcomeres are Z lines that compress in order to move the myofilaments to overlap each