Dominic Stone
The muscular system is responsible for allowing movement in the body. Skeletal muscles are the only muscles that can be consciously controlled. They are attached to bones, and when they contract, they cause movement of those bones. However, smooth muscles, such as those in the heart, are involuntary and are controlled by the autonomic nervous system, hormones, and local chemical signals.
| Characteristics | Values |
|---|---|
| Type of muscle | Skeletal, smooth, cardiac |
| Control | Skeletal muscles are the only muscles that can be consciously controlled |
| Involuntary muscles | Smooth muscles and cardiac muscles are involuntary |
| Smooth muscle control | Controlled by the autonomic nervous system, hormones, and local chemical signals |
| Cardiac muscle control | Controlled by the sinus node influenced by the autonomic nervous system |
| Motor unit coordination | Controlled by the cerebellum of the brain |
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What You'll Learn
- Skeletal muscles are the only muscles that can be consciously controlled
- Smooth muscles are involuntary and controlled by the autonomic nervous system
- Motor unit coordination, balance, and control are directed by the cerebellum of the brain
- Heart muscle is controlled by the sinus node
- Cardiac muscle stimulates its own contractions to form our heartbeat
Skeletal muscles are the only muscles that can be consciously controlled
Skeletal muscles are organised into hundreds of motor units, each of which involves a motor neuron, attached by a series of thin finger-like structures called axon terminals. These attach to and control discrete bundles of muscle fibres. A coordinated and fine-tuned response to a specific circumstance will involve controlling the precise number of motor units used. While individual muscle units contract as a unit, the entire muscle can contract on a predetermined basis due to the structure of the motor unit. Motor unit coordination, balance, and control frequently come under the direction of the cerebellum of the brain. This allows for complex muscular coordination with little conscious effort, such as when one drives a car without thinking about the process.
Smooth muscles, on the other hand, are involuntary. They are controlled by the autonomic nervous system and are found in the urinary system, blood vessels, and organs such as the stomach. Cardiac muscle, found only in the heart, is also involuntary. It pumps blood around the body and stimulates its own contractions to form our heartbeat.
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Smooth muscles are involuntary and controlled by the autonomic nervous system
Smooth muscles are involuntary and are controlled by the autonomic nervous system. They line the inside of blood vessels and organs, such as the stomach, and are also known as visceral muscles. Smooth muscle contraction is regulated by the autonomic nervous system, hormones, and local chemical signals, allowing for gradual and sustained contractions. This type of muscle tissue is also capable of adapting to different levels of stretch and tension, which is important for maintaining proper blood flow and the movement of materials through the digestive system. For example, muscles in the urinary system help rid the body of waste and toxins.
Unlike smooth muscles, skeletal muscles are the only muscles that can be consciously controlled. They are attached to bones, and contracting the muscles causes movement of those bones. Any action that a person consciously undertakes involves the use of skeletal muscles. Examples of such activities include running, chewing, and writing.
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Motor unit coordination, balance, and control are directed by the cerebellum of the brain
Skeletal muscles are the only muscles that can be consciously controlled. They are attached to bones, and when they contract, they cause movement of those bones. Any action that a person consciously undertakes involves the use of skeletal muscles. Examples of such activities include running, chewing, and writing.
Skeletal muscles are organised into hundreds of motor units, each of which involves a motor neuron, attached by a series of thin finger-like structures called axon terminals. These attach to and control discrete bundles of muscle fibres. A coordinated and fine-tuned response to a specific circumstance will involve controlling the precise number of motor units used. While individual muscle units contract as a unit, the entire muscle can contract on a predetermined basis due to the structure of the motor unit. Motor unit coordination, balance, and control are directed by the cerebellum of the brain. This allows for complex muscular coordination with little conscious effort, such as when one drives a car without thinking about the process.
Smooth muscles, such as those in the heart, are involuntary. They are controlled by the autonomic nervous system, which regulates their contraction. This type of muscle tissue is also capable of adapting to different levels of stretch and tension, which is important for maintaining proper blood flow and the movement of materials through the digestive system.
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Heart muscle is controlled by the sinus node
The heart muscle is striated muscle, distinct from skeletal muscle, as the muscle fibres are laterally connected. Heart muscle is controlled by the sinus node, which is influenced by the autonomic nervous system.
The heart muscle is also known as cardiac muscle, and it pumps blood around the body. Cardiac muscle stimulates its own contractions, which form our heartbeat. The nervous system controls the rate of contraction, which is involuntary.
The autonomic nervous system also controls smooth muscle contraction, which lines the inside of blood vessels and organs, such as the stomach. Smooth muscles are involuntary, and their movement is regulated by hormones and local chemical signals. This allows for gradual and sustained contractions, which are important for maintaining proper blood flow and the movement of materials through the digestive system.
Skeletal muscles, on the other hand, are the only muscles that can be consciously controlled. They are organised into hundreds of motor units, each of which involves a motor neuron attached to discrete bundles of muscle fibres. These muscles are responsible for any action that a person consciously undertakes, such as running, chewing, or writing.
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Cardiac muscle stimulates its own contractions to form our heartbeat
Skeletal muscles are the only muscles that can be consciously controlled. They are attached to bones, and when they contract, they cause movement of those bones. Any action that a person consciously undertakes involves the use of skeletal muscles, such as running, chewing, or writing.
However, cardiac muscle, which is located only in the heart, stimulates its own contractions to form our heartbeat. This type of muscle is strong and acts involuntarily. Signals from the nervous system control the rate of contraction.
Smooth muscles are also involuntary. They line the inside of blood vessels and organs, such as the stomach, and are also known as visceral muscles. The autonomic nervous system controls them, as well as hormones and local chemical signals, allowing for gradual and sustained contractions.
Motor unit coordination, balance, and control frequently come under the direction of the cerebellum of the brain. This allows for complex muscular coordination with little conscious effort, such as when one drives a car without thinking about the process.
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Frequently asked questions
Skeletal muscles are the only muscles that can be consciously controlled. They are attached to bones, and contracting the muscles causes movement of those bones.
Skeletal muscles are organised into hundreds of motor units, each of which involves a motor neuron, attached by a series of thin finger-like structures called axon terminals. These attach to and control discrete bundles of muscle fibres.
Smooth muscles are involuntary muscles. They line the inside of blood vessels and organs, such as the stomach, and are also known as visceral muscles.
Smooth muscle contraction is regulated by the autonomic nervous system, hormones, and local chemical signals, allowing for gradual and sustained contractions.
Cardiac muscles are located only in the heart and pump blood around the body. They stimulate their own contractions that form our heartbeat.
