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Questions and Answers
If a muscle cell's primary function is to contract and facilitate movement, which component within the muscle cell is directly responsible for this contraction?
If a muscle cell's primary function is to contract and facilitate movement, which component within the muscle cell is directly responsible for this contraction?
- Mitochondrion
- Myofibril (correct)
- Sarcoplasmic reticulum
- Sarcomere
During intense physical activity, muscles require a significant amount of energy. What is the primary source of immediate energy that muscle cells use to fuel their contractions?
During intense physical activity, muscles require a significant amount of energy. What is the primary source of immediate energy that muscle cells use to fuel their contractions?
- Fatty acids
- Glucose
- Amino acids
- Adenosine Triphosphate (ATP) (correct)
The human body uses lever systems to coordinate bones and muscles for movement. In a lever system, what is the primary purpose of generating muscular effort?
The human body uses lever systems to coordinate bones and muscles for movement. In a lever system, what is the primary purpose of generating muscular effort?
- To increase the speed of a given movement
- To overcome a given load (correct)
- To maintain posture and stability
- To reduce the amount of force required to move a load
Maintaining a stable body temperature is crucial for survival. Which of the following functions of muscle tissue directly contributes to thermoregulation?
Maintaining a stable body temperature is crucial for survival. Which of the following functions of muscle tissue directly contributes to thermoregulation?
Muscle tissue plays a role in several bodily functions. Which of the following is NOT a primary function of muscle tissue?
Muscle tissue plays a role in several bodily functions. Which of the following is NOT a primary function of muscle tissue?
The sarcomere is a fundamental unit within muscle tissue. What structural feature gives the sarcomere its characteristic appearance under a microscope?
The sarcomere is a fundamental unit within muscle tissue. What structural feature gives the sarcomere its characteristic appearance under a microscope?
Muscles account for a significant portion of a person’s body weight. Approximately what percentage of an average person’s weight is made up of muscle?
Muscles account for a significant portion of a person’s body weight. Approximately what percentage of an average person’s weight is made up of muscle?
Arrange the following in order from smallest to largest: muscle cell, myofibril, muscle tissue.
Arrange the following in order from smallest to largest: muscle cell, myofibril, muscle tissue.
Flashcards
Muscle Definition
Muscle Definition
Fibrous tissue in the body that can contract, producing movement or maintaining position.
Myofibril
Myofibril
The contractile thread of a muscle cell.
Sarcomere
Sarcomere
The basic structural unit of muscle, composed of fibrous proteins that slide past each other.
ATP's Role
ATP's Role
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Functions of Muscle
Functions of Muscle
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Lever Systems
Lever Systems
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Lever Functions
Lever Functions
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Heat for survival
Heat for survival
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Study Notes
- Muscle accounts for 40% of a person's weight
Definition of Muscle
- Muscle is a band of fibrous tissue in a human or animal body
- Muscle tissue can contract, producing movement in or maintaining body position
Myofibril
- Muscle tissue comprises muscle cells
- Muscle cells consist of several myofibrils
- A myofibril is a contractile thread of a muscle
- Myofibrils extend from one end of the muscle fibre to the other
Sarcomere
- The sarcomere comprised of long fibrous proteins
- These proteins slide past each other
- The sliding of these proteins creates the appearance of dark and light bands when viewed via a microscope
- Sarcomeres are the basic structural unit of a muscle.
Muscle Fuel
- Muscle cells fuel their actions with chemical energy
- The chemical energy is in the form of Adenosine Triphosphate (ATP)
- ATP comes from the metabolism of food
Functions of Muscle
- Posture/Muscle Tone
- Stability
- Mobility/Movement
- Circulation
- Respiration
- Digestion
- Temperature Regulation/Heat Production
- Organ Protection
- Urination
First order levers
- Lever systems are the coordination of bones and muscles to create movement
- Muscles can generate muscular effort to overcome a given load
- Muscles increase the speed of a given movement
Heat Production
- Healthy survival depends on the ability to maintain a constant body temperature
Muscle Tone
- A state of sustained partial contraction of a muscle
Muscle Fatigue
- Muscle fatigue is caused by not enough oxygen and nutrients
- Muscle fatigue results from a build-up of waste products
Properties of Muscle Tissue
- Muscle cells share several properties:
- Contractility
- Excitability
- Extensibility
- Elasticity
Contractility
- Contractility is the ability of muscle to forcefully shorten
- For a muscle to work, one will need to flex and the other contract
- Muscles can only pull, never push
Excitability
- Excitability is the ability to respond to a stimulus
- The stimulus is delivered from a motor neurone or hormone
Extensibility
- Extensibility is the ability for a muscle to be stretched
Elasticity
- Elasticity is the ability for the muscle to recoil or bounce back to its original length after being stretched
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Description
Explore the structure and function of muscles, which make up 40% of body weight. Learn about myofibrils, sarcomeres, and the role of ATP in powering muscle contractions for posture, stability, movement, and essential bodily functions.
