Muscle - Connective Tissue 4 Flashcards
4 main functions of muscle
Heat production
Posture
Joint stability
Movement
Importance of muscle tissue
Movement
Speaking
Chewing
Controls breathing, heartbeat and digestion
Temperature regulation
Vision
3 types of muscular tissue
Skeletal
Smooth
Cardiac
Skeletal
Moves bones of skeleton
Striated - alternating light and dark bands under microscope
Consists of parallel, non-branching multi nucleated muscle fibres united together in bundles.
Surrounded by a sheath - the sarcolemma
Skeletal - voluntary or involuntary
Voluntary - consciously controlled
Subconsciously to some extent - diaphragm contracts and relaxes with no control
Smooth muscle
Located in walls of hollow internal structures - blood vessels, airways etc
Lacks striating on skeletal and cardiac
Usually involuntary
Slow sustained mode of contraction
Spindle shaped cells - one central nucleus
No distinct sarcolemma - fine membrane covers tissue
Function of smooth muscle
Moves food down oesophagus
Urine down bladder
Regulates diameter of blood vessels
Controls diameter of respiratory passageways
Cardiac muscle
Only found in walls of heart
Striated
Involuntary
Main function of cardiac muscle
Involuntary propels blood to and form heart