Podcast
Questions and Answers
Which property of muscle allows it to respond to a stimulus?
Which property of muscle allows it to respond to a stimulus?
- Contractility
- Extensibility
- Elasticity
- Excitability (correct)
Which type of muscle tissue is responsible for locomotion and facial expressions?
Which type of muscle tissue is responsible for locomotion and facial expressions?
- Smooth
- Cardiac
- Skeletal (correct)
- None of the above
Which system controls the contraction of cardiac muscle?
Which system controls the contraction of cardiac muscle?
- Muscular system
- Endocrine system
- Skeletal system
- Autonomic nervous system (correct)
Which protein aligns the thick and thin filaments properly in skeletal muscle tissue?
Which protein aligns the thick and thin filaments properly in skeletal muscle tissue?
What is the function of myosin in skeletal muscle tissue?
What is the function of myosin in skeletal muscle tissue?
What happens when calcium ions bind to troponin in relaxed muscle?
What happens when calcium ions bind to troponin in relaxed muscle?
What is the role of titin in skeletal muscle tissue?
What is the role of titin in skeletal muscle tissue?
Which ion has a higher concentration inside the cell compared to outside the cell?
Which ion has a higher concentration inside the cell compared to outside the cell?
What is the resting membrane potential of a cell?
What is the resting membrane potential of a cell?
What type of ion channels open and close in response to small voltage changes across the plasma membrane?
What type of ion channels open and close in response to small voltage changes across the plasma membrane?
What is the phase of an action potential where the inside of the plasma membrane becomes less negative?
What is the phase of an action potential where the inside of the plasma membrane becomes less negative?
According to the text, what is the response of a muscle fiber to a sub-threshold stimulus?
According to the text, what is the response of a muscle fiber to a sub-threshold stimulus?
According to the text, what is the strength of contraction dependent on?
According to the text, what is the strength of contraction dependent on?
According to the text, what happens to the strength of contraction as the number of motor units responding to a stimulus increases?
According to the text, what happens to the strength of contraction as the number of motor units responding to a stimulus increases?
According to the text, what is the term used to describe the phenomenon where each subsequent contraction is stronger than the previous one until they all become equal?
According to the text, what is the term used to describe the phenomenon where each subsequent contraction is stronger than the previous one until they all become equal?
According to the text, what happens to muscle tension as the frequency of action potentials increases?
According to the text, what happens to muscle tension as the frequency of action potentials increases?
According to the text, what is the term used to describe the phenomenon where there is no relaxation between muscle contractions?
According to the text, what is the term used to describe the phenomenon where there is no relaxation between muscle contractions?
Which connective tissue surrounds a whole muscle and many fascicles?
Which connective tissue surrounds a whole muscle and many fascicles?
Which connective tissue surrounds a group of muscle fibers?
Which connective tissue surrounds a group of muscle fibers?
What is the function of Transverse (T) tubules in a muscle cell?
What is the function of Transverse (T) tubules in a muscle cell?
What is the basic functional unit of a myofibril?
What is the basic functional unit of a myofibril?
Which of the following is true about the neuromuscular junction?
Which of the following is true about the neuromuscular junction?
What is the role of acetylcholine in the neuromuscular junction?
What is the role of acetylcholine in the neuromuscular junction?
What happens when acetylcholine binds to ligand-gated Na+ channels on the postsynaptic membrane?
What happens when acetylcholine binds to ligand-gated Na+ channels on the postsynaptic membrane?
What is the role of acetylcholinesterase in the neuromuscular junction?
What is the role of acetylcholinesterase in the neuromuscular junction?
Which of the following is true during the depolarization phase of the action potential?
Which of the following is true during the depolarization phase of the action potential?
What is the role of sodium (Na+) channels during the depolarization phase of the action potential?
What is the role of sodium (Na+) channels during the depolarization phase of the action potential?
What causes the repolarization phase of the action potential?
What causes the repolarization phase of the action potential?
Which of the following is NOT a function of the muscular system?
Which of the following is NOT a function of the muscular system?
Which property of muscle allows it to respond to a stimulus?
Which property of muscle allows it to respond to a stimulus?
Which type of muscle tissue is controlled involuntarily by the endocrine and autonomic nervous systems?
Which type of muscle tissue is controlled involuntarily by the endocrine and autonomic nervous systems?
Which connective tissue surrounds a whole muscle and many fascicles?
Which connective tissue surrounds a whole muscle and many fascicles?
Which ion has a higher concentration inside the cell compared to outside the cell?
Which ion has a higher concentration inside the cell compared to outside the cell?
What is the resting membrane potential of a cell?
What is the resting membrane potential of a cell?
What is the role of the sodium-potassium pump?
What is the role of the sodium-potassium pump?
What is the function of Transverse (T) tubules in a muscle cell?
What is the function of Transverse (T) tubules in a muscle cell?
Which protein stabilizes the position of myosin and accounts for much of the elasticity and extensibility of myofibrils?
Which protein stabilizes the position of myosin and accounts for much of the elasticity and extensibility of myofibrils?
What is the region in the A band where actin and myosin do not overlap called?
What is the region in the A band where actin and myosin do not overlap called?
What is the role of tropomyosin in muscle contraction?
What is the role of tropomyosin in muscle contraction?
What is the function of the M line in skeletal muscle tissue?
What is the function of the M line in skeletal muscle tissue?
Which connective tissue surrounds a group of muscle fibers?
Which connective tissue surrounds a group of muscle fibers?
What is the function of Transverse (T) tubules in a muscle cell?
What is the function of Transverse (T) tubules in a muscle cell?
What is the role of acetylcholine in the neuromuscular junction?
What is the role of acetylcholine in the neuromuscular junction?
What is the basic functional unit of a myofibril?
What is the basic functional unit of a myofibril?
Which structure releases the neurotransmitter acetylcholine into the synaptic cleft?
Which structure releases the neurotransmitter acetylcholine into the synaptic cleft?
What is the role of acetylcholinesterase in the neuromuscular junction?
What is the role of acetylcholinesterase in the neuromuscular junction?
What is the function of the sarcoplasmic reticulum in muscle contraction?
What is the function of the sarcoplasmic reticulum in muscle contraction?
What is the role of troponin in muscle contraction?
What is the role of troponin in muscle contraction?
What is the term used to describe the phenomenon where the strength of contraction increases as the number of motor units responding to a stimulus increases?
What is the term used to describe the phenomenon where the strength of contraction increases as the number of motor units responding to a stimulus increases?
What is the term used to describe the phenomenon where each subsequent contraction is stronger than the previous one until they all become equal?
What is the term used to describe the phenomenon where each subsequent contraction is stronger than the previous one until they all become equal?
What is the term used to describe the phenomenon where there is no relaxation between muscle contractions?
What is the term used to describe the phenomenon where there is no relaxation between muscle contractions?
What is the term used to describe the phenomenon where the strength of contraction depends upon recruitment of motor units?
What is the term used to describe the phenomenon where the strength of contraction depends upon recruitment of motor units?
What is the term used to describe the phenomenon where muscle fibers partially relax between contractions during high frequency stimulation?
What is the term used to describe the phenomenon where muscle fibers partially relax between contractions during high frequency stimulation?
What is the term used to describe the phenomenon where muscle fibers do not relax between contractions during high frequency stimulation?
What is the term used to describe the phenomenon where muscle fibers do not relax between contractions during high frequency stimulation?
During the depolarization phase of the action potential, the membrane potential changes from approximately -85 mV to approximately +20 mV. During the repolarization phase, the inside of the plasma membrane changes from approximately +20 mV back to -85 mV.
During the depolarization phase of the action potential, the membrane potential changes from approximately -85 mV to approximately +20 mV. During the repolarization phase, the inside of the plasma membrane changes from approximately +20 mV back to -85 mV.
What is the change in membrane potential during the repolarization phase of the action potential?
What is the change in membrane potential during the repolarization phase of the action potential?
What is the difference in membrane potential between the depolarization and repolarization phases of the action potential?
What is the difference in membrane potential between the depolarization and repolarization phases of the action potential?
What is the total change in membrane potential during the action potential?
What is the total change in membrane potential during the action potential?
