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Aug 04, · Muscles have several main functions, including locomotion, heat production, structural support and muscle contractions. Feb 21, · Movement is the main function of muscular tissue. They have the ability to contract and this is what brings about the movement of body parts.
All muscle cells share several properties: contractility, excitability, extensibility, and elasticity:. Maintenance of posture: Without much conscious control, our muscles generate a constant contractile force that allows us to maintain an erect or seated position, or posture. Respiration: Our muscular system automatically drives movement of air into and out of our body.
Heat generation: Contraction of muscle tissue generates heat, which is essential for maintenance of temperature homeostasis.
For instance, if our core body temperature falls, we shiver to generate more heat. Communication: Muscle tissue allows us to talk, gesture, write, and convey our emotional state by doing such things as smiling or frowning. Constriction of organs and blood vessels: Nutrients move through our digestive tract, urine is passed out of the body, and secretions are propelled out of glands by contraction of smooth muscle.
Constriction or relaxation of blood vessels regulates blood pressure and blood distribution throughout the body. Pumping blood: Blood moves through the blood vessels because our heart tirelessly receives blood and delivers it to all body tissues and organs.
This isn't a complete list. Among the many possible examples are the facts that muscles help protect fragile internal what are the 3 main parts of the body by enclosing them, and are also critical in maintaining the integrity of body cavities.
For example, fetuses with incompletely formed diaphragms have abdominal contents herniate protrude up into the thoracic cavity, which inhibits normal lung growth and development. Even though this is an incomplete list, an appreciation of some of these basic muscle functions will help funcyions as we proceed.
Properties of muscle tissue All muscle cells share several properties: contractility, excitability, extensibility, and elasticity: Contractility is the ability of muscle cells to forcefully shorten. For instance, in order to flex functiohs the angle functons a joint your elbow you need to contract shorten the biceps brachii and other elbow flexor muscles in the anterior arm.
Notice that in order to extend your elbow, the posterior arm extensor muscles need to contract. Thus, muscles can only pull, never push. Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone.
Extensibility is the ability of a muscle how to make shibori fabric be stretched. For instance, let's reconsider our elbow flexing motion we discussed earlier.
In order to be able to flex the elbow, the elbow extensor muscles must extend in order to allow flexion to occur. Lack of extensibility is known as spasticity. Elasticity is the ability to recoil or bounce back to the muscle's original length after genrral stretched.
Oct 04, · Muscle tissue functions as a single unit, and is often connected to the same nerve bundles. A nerve impulse traveling from the brain or another outside signal tells the muscle to contract. 4 rows · Muscle tissue is characterized by properties that allow movement. Muscle cells are excitable; Author: Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat. Muscle tissue and functions. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. branbell3. Terms in this set (25) What is the purpose of muscle tissue. Transforms chemical energy (ATP) to directed mechanical energy - exerts force. What are the 3 types of muscle tissue.
Muscle is a soft tissue that is highly specialized for the production of tension which results in the generation of force. Muscle cells, or myocytes, contain myofibrils comprised of actin and myosin myofilaments which slide past each other producing tension that changes the shape of the myocyte. Numerous myocytes make up muscle tissue and the controlled production of tension in these cells can generate significant force. Muscle tissue can be classified functionally, voluntary or involuntary and morphologically striated or non-striated.
Voluntary refers to whether the muscle is under conscious control, striation refers to the presence of visible banding within myocytes which occurs due to organization of myofibrils to produce a constant direction of tension. By applying the above classifications it is possible to describe three forms of muscle tissue which perform the wide range of functions described. Skeletal muscle mainly attaches to the skeletal system via tendons to maintain posture and control movement for example contraction of the biceps muscle, attached to the scapula and radius, will raise the forearm.
Some skeletal muscle can attach directly to other muscles or the skin, as seen in the face where numerous muscles control facial expression. Skeletal muscle is under voluntary control, although this can be subconscious for example when maintaining posture or balance. Morphologically skeletal myocytes are elongated and tubular and appear striated with multiple peripheral nuclei. Cardiac muscle tissue is found only in the heart where cardiac contractions pump blood throughout the body and maintain blood pressure.
As with skeletal muscle cardiac muscle is striated, however it is not consciously controlled and so is involuntary. Cardiac muscle can be further differentiated from skeletal muscle by the presence of intercalated discs which control the synchronized contraction of cardiac tissues. Cardiac myocytes are shorter than skeletal equivalents and contain only one or two centrally located nuclei.
Smooth muscle tissue is found associated with numerous other organs and tissue systems such as the digestive system or respiratory system. It plays an important role in the regulation of flow in such tissues for example aiding the movement of food through the digestive system via peristalsis.
Smooth muscle is non-striated, although it contains the same myofilaments they are just organized differently, and involuntary. Smooth muscle myocytes are spindle shaped with a single centrally located nucleus.
By applying these classifications three muscle types can be described; skeletal, cardiac and smooth. Skeletal muscle is voluntary and striated, cardiac muscle is involuntary and straited and smooth muscle is involuntary and non-striated.
Key Terms skeletal muscle : The voluntary muscle of vertebrates, which is striated and anchored by tendons to bone, is used to effect skeletal movement such as locomotion. Licenses and Attributions. CC licensed content, Shared previously.