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Questions and Answers
Which of the following is not one of the major functions of muscles?
Which of the following is not one of the major functions of muscles?
- Movement
- Protection (correct)
- Posture
- Heat production
The plasma membrane of a muscle fiber is called the:
The plasma membrane of a muscle fiber is called the:
- sarcomere.
- myofibril.
- sarcolemma. (correct)
- sarcoplasm.
Bundles of fine fibers that extend lengthwise along muscle fibers are called:
Bundles of fine fibers that extend lengthwise along muscle fibers are called:
- myofibrils. (correct)
- sarcoplasmic reticulum.
- myofilaments.
- striae.
The smallest contractile unit of muscle is a:
The smallest contractile unit of muscle is a:
Which muscle is also known as striated muscle?
Which muscle is also known as striated muscle?
The ability of muscle cells to respond to nerve stimuli is called:
The ability of muscle cells to respond to nerve stimuli is called:
In the structure called a triad, the T-tubule is sandwiched between:
In the structure called a triad, the T-tubule is sandwiched between:
The chief function of the T-tubules is to:
The chief function of the T-tubules is to:
Which of the following proteins found in myofilaments contains the cross-bridges?
Which of the following proteins found in myofilaments contains the cross-bridges?
The protein molecule that has heads jutting out for cross-bridging is:
The protein molecule that has heads jutting out for cross-bridging is:
Thick myofilaments extend the length of the:
Thick myofilaments extend the length of the:
The neurotransmitter(s) secreted at the motor end plates of skeletal muscles is (are):
The neurotransmitter(s) secreted at the motor end plates of skeletal muscles is (are):
The first event to occur in muscle relaxation is that:
The first event to occur in muscle relaxation is that:
The ion necessary for cross-bridging is:
The ion necessary for cross-bridging is:
The purpose of creatine phosphate in muscle contraction is to:
The purpose of creatine phosphate in muscle contraction is to:
Aerobic respiration:
Aerobic respiration:
Skeletal muscles are innervated by:
Skeletal muscles are innervated by:
A motor unit is most correctly described as a:
A motor unit is most correctly described as a:
White fibers are also called:
White fibers are also called:
Endurance training is also known as:
Endurance training is also known as:
During which phase of the twitch contraction is there a triggering of the release of calcium ions into the sarcoplasm?
During which phase of the twitch contraction is there a triggering of the release of calcium ions into the sarcoplasm?
Physiological muscle fatigue may be caused by:
Physiological muscle fatigue may be caused by:
All of the following are true characteristics of an isometric contraction except:
All of the following are true characteristics of an isometric contraction except:
Attempting to pick up an object too heavy to lift would result in which type of muscle contraction?
Attempting to pick up an object too heavy to lift would result in which type of muscle contraction?
The graded strength principle states that:
The graded strength principle states that:
Painful muscle contractions or involuntary twitches are called:
Painful muscle contractions or involuntary twitches are called:
The strength of a muscle contraction is influenced by the:
The strength of a muscle contraction is influenced by the:
Which of the following types of muscle tissue contains cells that have a single nucleus?
Which of the following types of muscle tissue contains cells that have a single nucleus?
All of the following are characteristics of smooth muscle except:
All of the following are characteristics of smooth muscle except:
From smallest to largest, which of the following is the correct order of arrangement?
From smallest to largest, which of the following is the correct order of arrangement?
Sarcolemma is a:
Sarcolemma is a:
Which of the following is not associated with the thin myofilament?
Which of the following is not associated with the thin myofilament?
Cross-bridges are also called:
Cross-bridges are also called:
A contraction in which the tension within the muscle remains the same but the length changes is called a(n) __________ contraction.
A contraction in which the tension within the muscle remains the same but the length changes is called a(n) __________ contraction.
Most body movements are _____ contractions.
Most body movements are _____ contractions.
Flashcards
Sarcolemma
Sarcolemma
The plasma membrane of a muscle fiber.
Myofibrils
Myofibrils
Bundles of fine fibers that extend lengthwise along muscle fibers.
Sarcomere
Sarcomere
The smallest contractile unit of muscle.
Skeletal Muscle
Skeletal Muscle
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Irritability
Irritability
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T-tubules function
T-tubules function
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Myosin
Myosin
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A-band
A-band
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Acetylcholine
Acetylcholine
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Calcium
Calcium
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Study Notes
- Muscle functions include movement, heat production, and posture, but not protection.
- The plasma membrane of a muscle fiber is called the sarcolemma.
- Myofibrils are bundles of fine fibers that extend lengthwise along muscle fibers.
- The sarcomere is the smallest contractile unit of muscle.
- Skeletal muscle is also known as striated muscle.
- Irritability is the ability of muscle cells to respond to nerve stimuli.
- In a triad, the T-tubule is sandwiched between sacs of sarcoplasmic reticulum.
- The chief function of the T-tubules is to allow electrical signals to move deeper into the cell.
- Myosin, a protein found in myofilaments, contains the cross-bridges.
- Myosin is the protein molecule with heads jutting out for cross-bridging.
- Thick myofilaments extend the length of the A-band.
- Acetylcholine is released at the motor end plates of skeletal muscles.
- The sarcoplasmic reticulum begins actively pumping calcium back into its sacs as the first event in muscle relaxation.
- Calcium is necessary for cross-bridging.
- The purpose of creatine phosphate in muscle contraction is to replenish energy supply.
- Aerobic respiration produces the maximum amount of energy available from each glucose molecule.
- Skeletal muscles are innervated by somatic motor neurons.
- A motor unit is best described as muscle fibers and a motor neuron.
- White fibers are also called fast fibers.
- Most body movements are isotonic contractions.
- Endurance training is also known as aerobic training.
- The latent period of the twitch contraction triggers the release of calcium ions into the sarcoplasm.
- Physiological muscle fatigue may be caused by a relative lack of ATP, high levels of lactate, and failure of the sodium-potassium pumps.
- Movement is not a characteristic of an isometric contraction.
- An isotonic contraction is one in which the tension within the muscle remains the same, but the length changes.
- Attempting to pick up an object too heavy to lift results in an isometric contraction.
- The graded strength principle states that skeletal muscles contract with varying degrees of strength at different times.
- Painful muscle contractions or involuntary twitches are called cramps.
- The strength of a muscle contraction is influenced by the amount of load, initial length of muscle fibers, and recruitment of motor units.
- Smooth muscle tissue contains cells that have a single nucleus.
- Thin and thick filaments are aligned in sarcomeres in skeletal muscles, unlike smooth muscles.
- The correct order of arrangement from smallest to largest is myofilament, myofibril, and fiber.
- Sarcolemma is the unique name for the plasma membrane of a muscle fiber.
- Myosin is not associated with the thin myofilament.
- Cross-bridges are also called myosin heads.
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