15 Questions
Which type of muscle tissue is primarily responsible for controlling movements?
Skeletal muscle
What is the main function of smooth muscle?
Constriction of organs
Which type of muscle tissue is attached to bones through tendons?
Skeletal muscle
What is the main function of cardiac muscle?
Pumping blood
In which type of muscle tissue is the primary function to constrict various structures such as hollow organs and vessels?
Smooth muscle
Which type of muscle tissue is primarily responsible for controlling movements?
Skeletal muscle
What is the primary function of smooth muscle?
Constriction of hollow organs
In which type of muscle tissue is the action primarily to decrease the joint angle?
Flexor
Where is smooth muscle primarily located?
In the walls of hollow organs and vessels
Which type of muscle tissue is found in the walls of the heart and responsible for its contractions?
Cardiac muscle
Which type of muscle is primarily responsible for controlling movements in the human body?
Skeletal muscle
What is the primary function of smooth muscle in the human body?
Constriction of hollow organs and vessels
Where is cardiac muscle primarily found in the human body?
In the walls of the heart
What is the main function of skeletal muscle in the human body?
Controlling movements
Which type of muscle primarily performs the action of decreasing the joint angle in the human body?
Smooth muscle
Study Notes
- Skeletal muscle makes up approximately 40% of human body weight
- Attached to bones through tendons and responsible for controlling movements
- Parts of skeletal muscles and their functions:
- Extensor: increases joint angle
- Flexor: decreases joint angle
- Abductor: moves away from the center line
- Adductor: moves towards the center line
- Levator: moves upwards
- Depressor: moves downwards
- Pronator: rotates forearm
- Supinator: rotates forearm away from the body
- Rotator: rotates a joint
- Sphincter: causes contraction to close an opening
- Smooth muscle is found in the walls of hollow organs, vessels, eyes, glands, uterus, and skin
- Primary function is not related to movements but to the functions of the organs they are in
- Cardiac muscle is a type of striated muscle that is specialized for the contraction of the heart
- Contraction mechanism in skeletal muscles includes:
- Action potential: an electrical signal that triggers muscle contraction
- Excitation: the process by which a muscle is prepared for contraction
- Force-length relationship: the amount of force produced by a muscle depends on its length, which is defined as the length of the muscle fibers when it is not producing force
- Energy metabolism in relation to muscle contraction:
- Creatine phosphate (PC) provides energy for the first few seconds of muscle contraction
- Glycogen is broken down into glucose to produce energy for muscle contraction
- ATP is the primary energy source for muscle contraction
- Anaerobic metabolism produces energy without the use of oxygen, but it also produces waste products that can make muscle acidic and impair its function
- Aerobic metabolism produces energy with the use of oxygen and produces less waste products, but it takes longer for the energy to be available for muscle contraction.
- Lesson on muscle contraction energy metabolism was held on 25th November.
Test your knowledge of human physiology with this quiz focusing on muscle types, structure, contraction mechanisms, and energy metabolism related to muscle contractions.
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