The Muscular System
Types of Muscle Tissue
The muscular system is the network that converts energy into motion. Since muscles are essential to all animals they are incredibly complex. Muscles are able to self-heal and with practice, are able to grow substantially stronger. There are 3 types of muscle tissue found in the human body:
Skeletal Muscle: attached to bones and in most cases are responsible for voluntary movements
Smooth Muscle: responsible for involuntary free flow in vessels and intestines and contain one nucleus
Cardiac Muscle: involuntary muscle that is similar to smooth muscle and only found in the heart
Each type of muscle has a different structure and plays a different role in the body.
Skeletal Muscles
Skeletal muscles are usually attached to bones and are responsible for voluntary movements (dancing, shooting a basketball, etc.). Skeletal muscles have light and dark sequential bands that are called striations — striated muscle is another name for skeletal muscle. Most skeletal muscles are controlled by the central nervous system. The muscle cells
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Therefore, impulses from motor neurons control the contraction of skeletal muscle fibres. Neuromuscular junction is the point of contact between a motor neuron and a skeletal muscle cell. Vesicles located in the axon terminals of the neuron release a neurotransmitter called acetylcholine. The acetylcholine diffuses across the synapse, producing an impulse in the cell membrane of the muscular fibre. As a result of the impulse, calcium ions are released within the fibre. These calcium ions enable the interaction between actin and myosin filaments. Finally when the release of acetylcholine stops, the muscle cells relax from contraction. An enzyme is produced at the axon terminal which eradicates any remaining acetylcholine. The cell then pumps the calcium ions back into storage and the cross-bridges stop forming as contraction
which we are allow to control by ourselves are called the voluntary muscles and the ones we
The musculoskeletal allows the body to function through a group of muscles, bones, tendons, cartilage and ligaments. The body moves through different muscle contractions. This makes the bone pull towards the contracting muscles. The skeletal system provides a structure for the body, while the muscular system creates movement in the bones of the skeletal system by contracting and relaxing. When exercising, the muscles increase in pliability. This is when the muscles become more pliable as they become warm, reducing the chance of getting an injury. They become more pliable as the muscles contract really fast when exercising. The contractions generate heat take makes the muscle more pliable.
Smooth muscles are found in the skin, internal organs, reproductive system, major blood vessels, and excretory system. Skeletal muscles are composed of long fibers surrounded by a membranous sheath, the sarcolemma. Since the Skeletal muscles are under control by whom ever they belong to are called voluntary muscles. This muscle is attached to two or more bones which are then attached to the skeleton by tendons. For example, head and neck muscles; contraction of these muscles produces facial expressions and head movements. They are also responsible for speech and swallowing. Skeletal muscles are the main muscles which move your body. Muscles nearly always work in coordinated groups; contraction of one muscle is accompanied by relaxation of another, while other muscles stabilize nearby joints. Then the last of the muscle types is the Cardiac Muscle or the involuntary muscles. Cardiac muscles are not under conscious control they do not react by a persons decision or movement. and are connected to the nervous system which are stimulated by autonomic impulses. Cardiac muscles are found in your internal organs like the heart or the intestine. For example; they include muscles that propel food through the intestine and those that control sweating and blood pressure.
Muscle tissue enables movement of structures within the body and movement of the entire person. There are three types. Skeletal muscle tissue controls the structures of the body and allows us to walk. It is long and cylindrical in shape, with many nuclei located at the edges. Cardiac muscle tissue is found only in the heart and helps to control blow-flow. They are branched and have only one nucleus. Smooth muscle tissue is found in the
It is found in the walls of organs such as the Stomach, Oesophagus, Bronchi and in the walls of blood vessels. This muscle type is heated by involuntary neurogenic impulses and has slow, contractions used in controlling internal organs.
Skeletal muscle- these attach to the bones and have the main function of contracting to facilitate movement of the skeleton. Skeletal muscles can be called voluntary muscles; this is because we have control over them through nervous impulses from our brains which send messages to the muscle. Contractions can produce powerful, fast movements or small precision actions. Skeletal muscles also have the ability to stretch or contract and still return to their original shape.
muscles in your body are Skeletal muscles. Your heart is the only Cardiac muscle. Smooth
The muscles play major role in the body. Produce movement, maintain posture, stabilize joints, and help generate heat, assist in blood circulation. There are three types of muscles. Skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscles are most abundant and found attached to skeleton. They respond quickly to stimuli, help in adjusting individual to external environment and being capable of rapid contractions. Skeletal muscle act by contraction that results in shortening and pull on the tendons. Than this transfers the force to bone attached and makes desired movements. Skeletal muscles rarely work by themselves to make movements in the body. The biceps brachii muscle extends the arm at the elbow. When triceps is extending the
* Striated - also known as voluntary, skeletal or striped muscle is attached to the bones of the skeleton although some facial muscles are attached to skin.
3Skeletal Muscle. Skeletal muscle is the only voluntary muscle tissue in the human body. For example if a person speaks writes or performs any physical activity there body uses skeletal muscle. Most skeletal muscles are attached to two bones across a joint.
internal organs which consist of smooth muscle which cannot be under our control and cardiac
The muscular system consists of the main organs of just the muscles. The muscular system is responsible for the movement of the human body. There are around 700 named muscles attached to the bones of the skeletal system that make up half of a person’s body weight. Each muscle is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves. Muscle tissue is also found inside of the heart, digestive organs, and blood vessels. There are three types of muscle tissue which are Visceral, cardiac, and skeletal. Visceral muscle is found inside of organs like the stomach, intestines, and blood vessels. Visceral muscle is also the weakest of all muscle tissues. Since visceral muscle is controlled by the unconscious part
Skeletal muscle makes possible that we can move around and responsible for most of our behavior. They are the most abundant type of muscles and are found attached to the skeleton. They are innervated by the somatic nervous system and are therefore under voluntary control. They respond fast to stimulation and are capable of rapid contractions. They get fatigued easily because of their rapidity. A good example of skeletal muscles can be all the muscles of the body wall.
Slide 11- skeleton muscles- found around the skeleton. The distinguished features are- cylindrical, and on slides they appears highly striated.
these are the skeletal, smooth and cardiac. The smooth muscle is apart of the involuntary