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The human body is made up of around 700 muscles, which, along with the skeletal system, enable human movement. There are three types of muscle tissue: visceral, cardiac, and skeletal. Visceral muscle is the weakest type of muscle tissue and is found inside organs like the stomach and intestines. Cardiac muscle makes up the heart and is responsible for its rhythmic contractions. Skeletal muscles are the only type of voluntary muscle tissue in the human body and are responsible for every physical action that a person consciously performs. They are attached to bones by tendons and move by shortening their length, pulling on the tendons, and moving bones closer together. Flexor muscles decrease the angle between bones, helping to bend the elbow and knee, while extensor muscles increase the angle, helping to straighten the elbow and knee.
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What You'll Learn
- There are three types of muscle tissue: visceral, cardiac, and skeletal
- Skeletal muscles are controlled consciously and are responsible for all physical actions
- Cardiac muscle is striated, very strong, and resistant to high blood pressure
- Visceral muscle is the weakest of all muscle tissues and is controlled by the unconscious part of the brain
- Flexor muscles decrease the angle between bones, while extensor muscles increase it
There are three types of muscle tissue: visceral, cardiac, and skeletal
The human body is made up of many muscles that help us do everything, from breathing to running. There are over 600 muscles in the human body, and they can be grouped by location or the type of movement they enable. However, healthcare providers typically classify muscles based on the type of tissue they are made of. There are three types of muscle tissue: visceral, cardiac, and skeletal.
Visceral muscle, also known as smooth muscle, is found inside organs like the stomach, intestines, liver, pancreas, blood vessels, and the inside of the eye. It is the weakest of all muscle tissues and is controlled by the unconscious part of the brain. This means it is an involuntary muscle that cannot be directly controlled by the conscious mind. Smooth muscle gets its name from its lack of stripes when viewed microscopically, unlike skeletal and cardiac muscle.
Cardiac muscle, also called myocardium, is only found in the heart. It makes up the middle layers of the heart and does not exist anywhere else in the body. The cells of cardiac muscle tissue are striated, appearing to have light and dark stripes under a microscope. These stripes indicate that a muscle cell is very strong. The cells are also branched X or Y-shaped and are tightly connected by intercalated discs, allowing the muscle to resist high blood pressure and the strain of pumping blood. The heart contracts or beats about 100,000 times per day, pumping blood through the cardiovascular system. Like visceral muscle, cardiac muscle is also involuntary.
Skeletal muscle is the only voluntary muscle tissue in the human body, controlled by conscious thought. Every physical action that a person consciously performs, such as speaking, walking, or writing, requires skeletal muscle. Skeletal muscles are attached to the skeleton and work with bones, tendons, and ligaments to support body weight and enable movement. Most skeletal muscles are attached to two bones across a joint through tendons, allowing the muscle to move parts of those bones closer to each other. Skeletal muscle cells are formed from smaller progenitor cells that combine to create long, straight, multinucleated fibres. Like cardiac muscle, skeletal muscle is also striated, giving it strength.
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Skeletal muscles are controlled consciously and are responsible for all physical actions
The human body has about 700 named muscles, which make up roughly half of a person's body weight. There are three types of muscles: skeletal, cardiac, and visceral. Skeletal muscles are the only voluntary muscles in the human body, meaning they are controlled consciously. They are attached to the bones of the skeletal system and allow us to perform a wide range of movements and functions. Every physical action that a person consciously performs, such as speaking, walking, or writing, requires skeletal muscle.
Skeletal muscles are responsible for producing movement, sustaining body posture and position, maintaining body temperature, storing nutrients, and stabilizing joints. They derive their name from the fact that they always connect to the skeleton in at least one place. Most skeletal muscles are attached to two bones across a joint through tendons, and they contract to move parts of the body closer to the bone that the muscle is attached to. The muscle acts as the effort force, while the bone that the muscle moves acts as the lever.
Skeletal muscles are composed of bundles of muscle fibers called myofibers, which contain several myofibrils. These muscle fibers are red and white and appear striated or striped under a microscope. The striations indicate that the muscle cell is very strong. Skeletal muscle cells form when many smaller progenitor cells come together to form long, straight, multinucleated fibers. The force of contraction depends on the number of motor units recruited and the frequency of action potentials that reach those units.
Skeletal muscle mass varies from person to person and is influenced by factors such as gender, height, weight, and age. Males generally have more skeletal muscle mass than females, and taller or overweight individuals tend to have higher muscle mass. Additionally, muscle mass tends to decrease with age. Skeletal muscles are susceptible to various conditions, ranging from mild injuries to serious or life-threatening myopathies. Therefore, it is essential to maintain muscle strength and overall health.
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Cardiac muscle is striated, very strong, and resistant to high blood pressure
The human body is made up of about 700 named muscles that account for roughly half of a person's body weight. These muscles are responsible for the body's movement and can be categorised into three types: visceral, cardiac, and skeletal.
Cardiac muscle, also known as myocardium, is a subtype of muscle tissue that constitutes the main tissue of the heart wall. It is an involuntary, striated muscle, meaning that it appears to have light and dark stripes when viewed under a microscope. The light bands are composed mainly of actin, while the darker bands are composed primarily of myosin. The striations indicate that the cardiac muscle is very strong and can generate sufficient force to pump blood into circulation. This is in contrast to visceral muscles, which are the weakest of all muscle tissues.
The cells of cardiac muscle are branched and tightly connected by intercalated discs, forming long fibres. These intercalated discs provide a strong bond between the cells and allow the muscle to resist high blood pressure. They also facilitate the rapid spread of electrochemical signals from cell to cell, ensuring the heart beats as a unit.
Cardiac muscle tissue contains additional large and elongated mitochondria located between the myofibrils, which provide the energy needed for the cell in the form of adenosine triphosphate (ATP). This makes cardiac muscle highly resistant to fatigue. Furthermore, the presence of extra glycogen granules between the myofibrils provides an additional energy source.
Cardiac muscle is capable of strong, continuous, and rhythmic contractions that are automatically generated to meet the metabolic demands of the body. However, it is important to note that cardiac muscle can become damaged due to various factors, including long-standing high blood pressure, hypertension, and abnormal heart racing. If the damage is severe, the pumping function of the heart may be reduced, resulting in heart failure.
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Visceral muscle is the weakest of all muscle tissues and is controlled by the unconscious part of the brain
There are three types of muscle tissue in the human body: visceral, cardiac, and skeletal. Visceral muscle, also known as smooth muscle, is found in the walls of hollow organs such as the stomach, intestines, and blood vessels. It is the weakest of all muscle tissues and contracts slowly and steadily to move substances through the organs.
Unlike skeletal muscle, which is controlled by conscious thought, visceral muscle is governed by the unconscious part of the brain. This is because visceral muscle is responsible for involuntary functions that do not require conscious control, such as the movement of food through the digestive tract. This is also why visceral muscle is sometimes referred to as an involuntary muscle.
The smooth appearance of visceral muscle under a microscope stands in contrast to the banded appearance of skeletal and cardiac muscles. Skeletal muscle is the only voluntary muscle tissue in the human body and is responsible for all physical actions that a person consciously performs, such as speaking, walking, or writing. Cardiac muscle, on the other hand, is found only in the heart and is responsible for pumping blood throughout the body. While cardiac muscle cannot be controlled consciously, it is also considered an involuntary muscle.
The visceral motor system, which includes the sympathetic and parasympathetic subsystems, controls the activity of smooth muscle fibers, cardiac muscle fibers, and glands. The major locus of central control in this system is the hypothalamus and the circuitry it controls in the brainstem tegmentum and spinal cord. This system contributes to the overall physiological balance of bodily functions, known as homeostasis.
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Flexor muscles decrease the angle between bones, while extensor muscles increase it
The human body is made up of around 700 named muscles, which make up roughly half of a person's body weight. These muscles are responsible for the movement of the human body. There are three types of muscle tissue: visceral, cardiac, and skeletal.
Flexor muscles and extensor muscles are two types of skeletal muscles found in the human body. They form a pair of antagonistic muscles that function together to bring about movement at the joints. Flexor muscles function to bend or decrease the angle between two bones or body parts at a joint, resulting in flexion. They work by contracting and pulling on tendons attached to bones, bringing the connected bones closer together. For example, the biceps brachii flexes the elbow, and the flexor digitorum bends the fingers.
Extensor muscles, on the other hand, are responsible for straightening or increasing the angle between two bones or body parts at a joint. They also contract and pull on tendons, but they move the connected bones away from each other. Examples of extensor muscles include the triceps brachii, which extends the elbow, and the quadriceps femoris, which extends the knee.
Flexor and extensor muscles often work in pairs, providing balance and controlled movement in various activities such as walking, standing, and lifting. They are crucial for ensuring proper regular movement and posture in our day-to-day lives.
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