Podcast
Questions and Answers
Which of the following best describes the relationship between muscle cells, myofibrils, and sarcomeres?
Which of the following best describes the relationship between muscle cells, myofibrils, and sarcomeres?
- Sarcomeres are composed of muscle cells, which in turn consist of several myofibrils.
- Muscle cells consist of several myofibrils, and sarcomeres are the basic structural units of the myofibrils. (correct)
- Muscle cells are the basic structural units, composed of sarcomeres, which in turn consist of myofibrils.
- Myofibrils are made up of muscle cells, which contain several sarcomeres.
If a movement requires both a large muscular effort to overcome a load and an increase in the speed of movement, which lever system would be most effective?
If a movement requires both a large muscular effort to overcome a load and an increase in the speed of movement, which lever system would be most effective?
- The effectiveness depends on the specific arrangement of the lever system and the load. (correct)
- First-order lever, as it balances effort and load equally.
- Second-order lever, as it always provides a mechanical advantage for force.
- Third-order lever, as it is primarily designed for speed and range of motion, though at the expense of force.
Which function of muscle tissue is most directly related to maintaining a stable internal environment during exposure to cold temperatures?
Which function of muscle tissue is most directly related to maintaining a stable internal environment during exposure to cold temperatures?
- Mobility/Movement.
- Digestion.
- Temperature Regulation/Heat Production. (correct)
- Organ Protection.
What is the primary source of energy that muscle cells use to fuel contraction, and how is this energy derived?
What is the primary source of energy that muscle cells use to fuel contraction, and how is this energy derived?
Which of the following activities relies most heavily on the 'Mobility/Movement' function of muscles?
Which of the following activities relies most heavily on the 'Mobility/Movement' function of muscles?
Which of the following situations exemplifies the 'Stability' function of muscles?
Which of the following situations exemplifies the 'Stability' function of muscles?
How does muscle tissue contribute to the function of 'Organ Protection'?
How does muscle tissue contribute to the function of 'Organ Protection'?
Which of the following physiological processes is LEAST directly influenced by the muscular system?
Which of the following physiological processes is LEAST directly influenced by the muscular system?
Flashcards
Muscle Definition
Muscle Definition
Fibrous tissue in the body that can contract, producing movement or maintaining body position.
Myofibril
Myofibril
The contractile thread of a muscle, composed of sarcomeres.
Sarcomere
Sarcomere
The basic structural unit of a muscle, responsible for muscle contraction.
Muscle Fuel (ATP)
Muscle Fuel (ATP)
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Functions of Muscle
Functions of Muscle
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Lever Systems
Lever Systems
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Lever System Functions
Lever System Functions
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Heat Production
Heat Production
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Study Notes
- Muscle accounts for 40% of a person's weight.
- Definition of muscle: A band of fibrous tissue in a human or animal body that can contract, producing movement or maintaining body position.
Myofibril
- Muscle tissue consists of muscle cells, which comprise several myofibrils.
- Myofibrils are contractile threads within muscles.
- Myofibrils extend from one end of the muscle fiber to the other.
Sarcomere
- Sarcomeres consist of long fibrous proteins that slide past each other, creating dark and light bands microscopically.
- The sarcomere is the fundamental structural unit of a muscle.
Muscle Fuel
- Muscle cells convert chemical energy into Adenosine Triphosphate (ATP) to fuel their actions.
- ATP is derived from the metabolism of food into chemical energy.
Functions of Muscle
- Posture and muscle tone are functions of muscle.
- Stability is a function of muscle.
- Mobility and Movement are functions of muscle. -Circulation is a function of muscle.
- Respiration is a function of muscle.
- Digestion is a function of muscle.
- Temperature regulation and heat regulation are functions of muscle.
- Organ Protection is a function of muscle.
- Urination is a function of muscle.
First Order Levers
- Lever systems coordinate bones and muscles to create movement.
- First order lever's main functions: to generate muscular effort to overcome a given load; to increase the speed of a given movement.
- See https://www.youtube.com/watch?v=V1NC5wOg0TM
Heat production
- Healthy survival depends on maintaining a constant body temperature.
- Muscle tone is a state of sustained partial contraction of a muscle.
Muscle Fatigue
- Muscle fatigue occurs when there is not enough oxygen and nutrients.
- Buildup of waste products also causes muscle fatigue.
Properties of Muscle Tissue
- All muscle cells share several properties
- Contractility: The ability of muscle to forcefully shorten.
- Excitability: The ability to respond to a stimulus.
- Extensibility: The ability for a muscle to be stretched.
- Elasticity: The ability for the muscle to recoil or bounce back to its original length after being stretched.
Contractility
- This is is the capacity of a muscle to forcefully shorten.
- For muscles to work, one must flex, and the other must contract.
- Muscles can only pull and never push.
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