The Muscular System: Anatomy and Physiology (01:42)
Muscles permit movement, circulate blood, and maintain posture. All muscle tissue possesses four properties: excitability, contractility, extensibility, and elasticity. The three kinds of muscle tissue include smooth muscle, skeletal muscle, and cardiac muscle.
Skeletal Muscle (03:14)
There are over 600 skeletal muscles in the human body and most can be consciously controlled. Because each muscle can only pull, normally two muscles are paired together to move joints. Tendons connect muscle to bone, but not all skeletal muscles are attached to bones.
Muscle Contraction (04:01)
Spindle-shaped muscles contain fascicles with multi external nuclei and myofibrils. Depending on the weight of an object that needs to be lifted, the nerves will trigger a certain amount of fascicles to contract. Skeletal muscles incorporate the digestive system, circulatory system and respiratory system to burn oxygen and fuel and to remove the excess lactic acid.
Smooth Muscle (02:58)
Smooth muscle is usually controlled by the autonomic nervous system and exists in many of our organs and the circulatory system. With only one nucleus, smooth muscles can contract more gradually and remain contracted for a long time. Peristalsis occurs because smooth muscle in the esophagus or small intestine alternate to form contractions.
Cardiac Muscle (02:14)
Myocardium forms the wall of the heart. Unlike skeletal muscle, there is only one nucleus per cell and has nodal tissues to help conduct electrical current. The cardiac muscle can speed up if the body needs more oxygen or nutrients.
Credits: The Muscular System (00:13)
Credits: The Muscular System
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