muscle physiology
DESCRIPTION
Muscle Physiology. Types of Muscle. Skeletal Attached to bones Makes up 40% of body weight Responsible for locomotion, facial expressions, posture, respiratory movements, other types of body movement Voluntary in action; controlled by somatic motor neurons Smooth - PowerPoint PPT PresentationTRANSCRIPT
Muscle Physiology
Types of Muscle• Skeletal
– Attached to bones– Makes up 40% of body weight– Responsible for locomotion, facial expressions, posture, respiratory
movements, other types of body movement– Voluntary in action; controlled by somatic motor neurons
• Smooth– In the walls of hollow organs, blood vessels, eye, glands, uterus, skin– Some functions: propel urine, mix food in digestive tract,
dilating/constricting pupils, regulating blood flow, – In some locations, autorhythmic– Controlled involuntarily by endocrine and autonomic nervous systems
• Cardiac– Heart: major source of movement of blood– Autorhythmic– Controlled involuntarily by endocrine and autonomic nervous systems
1- Skeletal Muscle Structure
– Muscle = group of fascicles– Muscle fibers extend length of muscle from
tendon to tendon
• Connective Tissue of a Muscle– Epimysium. Dense regular c.t.
surrounding entire muscle• Separates muscle from
surrounding tissues and organs• Connected to the deep fascia
– Perimysium. Collagen and elastic fibers surrounding a group of muscle fibers called a fascicle
• Contains b.v and nerves– Endomysium. Loose
connective tissue that surrounds individual muscle fibers
• Also contains b.v., nerves, and satellite cells (embryonic stem cells function in repair of muscle tissue
• Collagen fibers of all 3 layers come together at each end of muscle to form a tendon or aponeurosis.
• Connective Tissue of a Muscle
Epimysium. Dense regular c.t. surrounding entire muscle
• Separates muscle from surrounding tissues and organs
• Connective Tissue of a Muscle
– Perimysium. Collagen and elastic fibers surrounding a group of muscle fibers called a fascicle
• Connective Tissue of a Muscle
– Endomysium. Loose connective tissue that surrounds individual muscle fibers
Fig. 10.03
Fig. 10.04
Fig. 10.06
Fig. 10.07