Muscular tissue consist of elongated cells called muscle fibers that produce the force responsible for movement of arms, legs, heart, stomach, and other parts of body.
Muscle is contractile tissue and is derived from mesodermal layer of embryonic germ cells.
Muscle tissue consist of fibers (cells) that are constructed to generate force for contraction.
As a result muscle tissue provide motion, maintain posture (provides stabilization) and generates heart (thermogenesis).
Bone and joint cannot move by themselves, driving force, power behind movement is muscle tissue.
Characteristics of muscle tissue
1. Excitability (irritability)
2. Contractility
3. Extensibility
4. Elasticity
5. Conductivity
1. Excitability (irritability)
Tissue can receive and respond to stimulation.
For muscle, chemical neurotransmitter released by neurons or hormone distributed by blood.
2. Contractility
Ability to contact (shorten and thicken) generating force to do work.
3. Extensibility
Ability to stretched (without damage tissue)
4. Elasticity
Ability to return to it's original length and size after contraction or extension.
5. Conductivity
Signal muscle to contract spread throughput entire muscle.
Function of muscle tissue
1. Create motion
Movement, walking, nodding
Movement of bones
Beating of heart
Churning of food in stomach
Contraction in gall bladder and urinary bladder.
Peristalsis (squeezing of intestine)
a. Skeletal muscles assist movement of cardiovascular and lymphatic vessel through contraction.
b. Smooth muscle; move the food through digestive system.
(Movement of wall in hollow organ)
c. Cardiac muscle; move blood through blood vessel.
(Pumping of blood of heart)
2. Maintaining posture (stabilize body position)
Skeletal muscle contractions maintain body in stable position.
Standing, Sitting
3. Thermogenesis (generation of heat)
(Generation of heat; 85% of all body heat)
Skeletal muscle contract to perform work result in heat energy release. (Used do maintain normal body temperature).
4. Storing substances and regulating organ volume.
Band of smooth muscle (called sphincters) prevent outflow of content of hollow organ.
Temporary storage of food in stomach or urine in urinary bladder possible because smooth muscle close off the exit route.
5. Move substance
Blood, lymph, urine, air, food and fluids
0 Comments