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Rigor Mortis and Muscle Contraction | Muscular System

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Rigor mortis is a postmortem change resulting in the stiffening of the body muscles due to chemical changes in their myofibrils. Rigor mortis helps in estimating the time since death as well to ascertain if the body had been moved after death.

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Rigor Mortis and Muscle Contraction | Muscular System

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Automacity is the ability to spontaneously depolarize and generate an action potential. Examples of automaticity are common activities such as walking, speaking, bicycle-riding, assembly-line work, and driving a car.

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Excabiltity is the ability of the muscle to receive and respond to stimuli via generation of an electricial pulse which causes contraction of the muscle cells.
They get excited due motor neurons or  hormones

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Elasticity is the ability of a muscle fiber to recoil and resume its resting length.
Examples of activities that use a stretch or reflex of the muscle and also store elastic energy to produce dynamic movement are jumping activities. Activities that develop elastic strength for running are hopping, bounding and jumping.

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Contractility is the ability of the muscle to shorten. Contractility allows muscle tissue to pull on its attachment points and shorten with force. Muscles can only pull, never push.

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Extensibility is the ability of the muscles to be stretched or extended. For example, let's consider our elbows  flexing motion. 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.

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042 How Calcium ion release results in Muscle Contraction

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Calcium affects muscles by regulating contractions. This includes regulating the heart beating because the heart is a muscle that pumps blood. Calcium is released when a nerve stimulates a muscle.

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042 How Calcium ion release results in Muscle Contraction

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Myosin is the prototype of a molecular motor—a protein that converts chemical energy in the form of ATP to mechanical energy, thus generating force and movement. Myosins belong to a family of motor proteins in muscles to enable muscle contraction. They may also be present in other cells such as amoebae and macrophages as a motor protein involved in different motility processes. Their fundamental properties include capability to bind with actin and ATPase enzyme activity.

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a protein that forms the contractile filaments of muscle cells, and is also involved in motion in other types of cells. Actin filaments are made up of identical actin proteins arranged in a long spiral chain.

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The sliding filament theory describes the mechanism that allows muscles to contract. According to this theory, myosin binds to actin. The myosin then alters its configuration, resulting in a "stroke" that pulls on the actin filament and causes it to slide across the myosin filament.

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Cardiac muscle: characteristics, functions and location (preview) - Human Histology | Kenhub

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The Cardiac muscle forms the muscular walls of the heart. The Cardiac muscles have striated, lobular, branched, and unnucleated cells. The fibers are found  in the heart. Cardiac Muscles are involuntary.

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Cardiac muscle: characteristics, functions and location (preview) - Human Histology | Kenhub

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The Skeletal muscle attaches to the bone and makes body movement possible. The cells look striated, tubular, and multinucleated. The fibers are usually attached to the skeleton. The Skeletal muscle is voluntary.

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Skeletal muscle: tissue and structure (preview)  - Human Histology | Kenhub

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Smooth muscle: location and cells (preview) - Human Histology | Kenhub

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Smooth Muscle is located in the wall of internal organs such as the digestive tract, blood vessels, and the ducts leading to the glands. They have narrow tapered rod shaped cells that are non striated, unnucleated. The fibers are found  in the walls of internal organs and the blood vessels. The smooth muscles are involuntary muscles.

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Smooth muscle: location and cells (preview) - Human Histology | Kenhub

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Tetany is a symptom characterized by the involuntary contraction of muscles that leads to painful muscle cramps, spasms of the voice box (i.e., larynx), and sensory disturbances. It is most commonly associated with low blood calcium levels, or hypocalcemia, although it can also appear with other metabolic irregularities. Mild symptoms include numbness around the mouth, painful muscle cramps, and a burning or tingling sensation of the hands and feet, known as paresthesia. In severe cases, individuals may present with spasms of the voice box (i.e., laryngospasm), which can make breathing difficult and lead to high-pitched sounds while breathing (i.e., laryngeal stridor). Individuals with tetany may also experience vomiting, generalized muscle cramps, seizures, and decreased cardiac function, such as an irregular heart rhythm.

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Tetanus is a bacterial disease marked by rigidity and spasms of the voluntary muscles. The spores can get into the body through broken skin, usually through injuries from contaminated objects. Tetanus affects the nerves that control your muscles, which can lead to difficulty swallowing. You may also experience spasms and stiffness in various muscles, especially those in your jaw, abdomen, chest, back, and neck.

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Tetanus (Medical Definition) | Quick Explainer Video

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Clonic spasms refer to alternating involuntary muscular contraction and relaxation in quick succession while tonic spasms are rigid muscle contractions that last a period of time. They both are involuntary muscle spasms so they are contractions of the muscles in the body that occur without control.

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A spasm is a sudden involuntary muscular contraction or convulsive movement. Spasms occur when you are stressed or have anxiety. You can alleviate pain from muscle spasms by taking a NSAID , such as ibuprofen.

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Muscle Fatigue is a state of exhaustion or loss of strength and/or muscle endurance following strenuous activity associated with the accumulation of lactic acid in muscles. Muscle Fatigue happens when you do strenuous exercises. This in turn causes you to have pain and feel weaker.

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Muscle Fatigue: Why do muscles get tired and weak after exercise?

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5 Basic Functions of the Muscular System

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5 Basic Functions of the Muscular System

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1. Muscles hold the body erect.
2. Muscles make movement possible.
3. Muscles move food through the digestive system.
4. Muscle movement aids the flow of blood through the veins.
5. Muscles actions move fluid through the ducts and tubes associated with other body systems.

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The Skeletal System - Skeletal System Functions - Skeletal System Basics

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Tendons - What Are Tendons - Functions Of Tendons - Tendonitis

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Tendons are narrow bands of non elastic, dense fibrous connective tissue that attaches muscle to bones. The tendons and muscles work together to control joint movement. The calcaneal tendon, commonly known as the Achilles tendon, is the strongest and largest tendon of the human body.

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Tendons - What Are Tendons - Functions Of Tendons - Tendonitis

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The fascia is a sheet of fibrous connective tissue that covers, supports, and separates muscles or muscle groups. This is flexible in order to allow movement. The fascia is found beneath your skin.