Explain the functional relationship between the muscular system and other body systems, and explain the role of exercise in producing various. Anatomy of the Muscular System Chapter Facial muscles. Sternocleidomastoid. Trapezius. Pectoralis major. Serratus anterior. Rectus abdominis. C h a p t e r. 9. The Muscular. System—Skeletal. Muscle Tissue and Organization . PowerPoint® Lecture Slides prepared by Jason LaPres. North Harris College.

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The muscular system is the biological system of humans that produces movement. The muscular system, in vertebrates, is controlled through the nervous system. An Introduction to the Muscular System. • The “Muscular System”. • Consists only of skeletal muscles. • Muscle Organization and Function. • Muscle organization. Your Muscular. System and Health. News Report. Instruct students to write a news story in which they report the functions of the three types of muscles. Students.

Muscles also protect the bones and organs by absorbing shock and reducing friction in the joints.

Temperature regulation Maintaining normal body temperature is an important function of the muscular system. Almost 85 percent of the heat a person generates in their body comes from contracting muscles.

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When body heat falls below optimal levels, the skeletal muscles increase their activity to make heat. Shivering is one example of this mechanism.

Muscles in the blood vessels also contract to maintain body heat. Body temperature can be brought back within normal range through the relaxation of smooth muscle in the blood vessels.

Muscular system

This action increases blood flow and releases excess heat through the skin. Five fun facts about the muscular system Muscles make up approximately 40 percent of total weight.

Use the words actin, myosin, and sarcomere. When a muscle is relaxed actin and myosin myofilaments are lying side by side and the H zones and I bands are at their greatest width.


This changes when muscles contract. You've reached the end of this preview. Share this link with a friend: Other Related Materials 93 pages. When the muscle no longer needs to contract, the calcium ions are pumped from the sarcomere and back into storage in the sarcoplasmic reticulum.

There are approximately skeletal muscles in the human body. Skeletal muscles, viewed from the front Skeletal muscles, viewed from the back Cardiac muscle Main article: Heart muscle Heart muscles are distinct from skeletal muscles because the muscle fibers are laterally connected to each other.

Furthermore, just as with smooth muscles, their movement is involuntary.

Heart muscles are controlled by the sinus node influenced by the autonomic nervous system. Smooth muscle Main article: Smooth muscle Smooth muscles are controlled directly by the autonomic nervous system and are involuntary, meaning that they are incapable of being moved by conscious thought.

Muscular system

Functions such as heartbeat and lungs which are capable of being willingly controlled, be it to a limited extent are involuntary muscles but are not smooth muscles. Physiology Contraction This section does not cite any sources.

Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. October Learn how and when to remove this template message Neuromuscular junctions are the focal point where a motor neuron attaches to a muscle.

Acetylcholine, a neurotransmitter used in skeletal muscle contraction is released from the axon terminal of the nerve cell when an action potential reaches the microscopic junction called a synapse.

A group of chemical messengers cross the synapse and stimulate the formation of electrical changes, which are produced in the muscle cell when the acetylcholine binds to receptors on its surface. Calcium is released from its storage area in the cell's sarcoplasmic reticulum. An impulse from a nerve cell causes calcium release and brings about a single, short muscle contraction called a muscle twitch.

If there is a problem at the neuromuscular junction, a very prolonged contraction may occur, such as the muscle contractions that result from tetanus.Help Center Find new research papers in: The T tubules have the same general properties as the sarcolemma.

Exercise helps to retain muscle mass and strength. The Wikibook Anatomy and Physiology of Animals has a page on the topic of: The free head, which projects outward toward the nearest thin filament, consists of two globular protein subunits.

Muscles causing movement at the elbow include the biceps brachii and triceps brachii. To remain healthy, muscles must be regularly exercised.

A single thin filament contains four proteins:

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