Podcast
Questions and Answers
What is the primary function of the sarcoplasmic reticulum in muscle cells?
What is the primary function of the sarcoplasmic reticulum in muscle cells?
- Generates action potentials
- Anchors myosin filaments
- Stores and releases calcium ions (correct)
- Forms attachment sites for actin
Which protein serves as the attachment site on actin for calcium ions?
Which protein serves as the attachment site on actin for calcium ions?
- Myosin
- Z disk
- Tropomyosin
- Troponin (correct)
In a sarcomere, where do you find the H zone?
In a sarcomere, where do you find the H zone?
- Attachment site for actin
- Center of the sarcomere (correct)
- Contains only actin
- Where actin and myosin overlap
During depolarization of a muscle fiber, what happens to the charge inside the cell?
During depolarization of a muscle fiber, what happens to the charge inside the cell?
What is the main function of the sodium-potassium pump in muscle cells?
What is the main function of the sodium-potassium pump in muscle cells?
Where are M lines located in a sarcomere?
Where are M lines located in a sarcomere?
What is the role of Acetylcholine in muscle contraction?
What is the role of Acetylcholine in muscle contraction?
Where does the binding of Acetylcholine to receptor sites occur?
Where does the binding of Acetylcholine to receptor sites occur?
What happens when Ca2+ binds to troponin during muscle contraction?
What happens when Ca2+ binds to troponin during muscle contraction?
Which structure stores and releases neurotransmitters like Acetylcholine?
Which structure stores and releases neurotransmitters like Acetylcholine?
What is the primary function of a motor neuron in muscle contraction?
What is the primary function of a motor neuron in muscle contraction?
What occurs when ATP binds to myosin during muscle contraction?
What occurs when ATP binds to myosin during muscle contraction?
What is the term for the weakest stimulus needed to produce a muscle response?
What is the term for the weakest stimulus needed to produce a muscle response?
In which type of muscle contraction does the muscle remain contracted?
In which type of muscle contraction does the muscle remain contracted?
Which type of muscle fibers contract slowly and fatigue slowly?
Which type of muscle fibers contract slowly and fatigue slowly?
What is the function of myoglobin in muscles?
What is the function of myoglobin in muscles?
Which type of muscle fiber contracts quickly and fatigues quickly?
Which type of muscle fiber contracts quickly and fatigues quickly?
What determines the distribution of slow and fast twitch muscle fibers in humans?
What determines the distribution of slow and fast twitch muscle fibers in humans?
Which muscle in the upper limb is known as the 'flexing muscle'?
Which muscle in the upper limb is known as the 'flexing muscle'?
Which muscle is responsible for inverting the foot?
Which muscle is responsible for inverting the foot?
How many origins does the triceps muscle have?
How many origins does the triceps muscle have?
Which muscle is located between the ribs and is responsible for elevating them?
Which muscle is located between the ribs and is responsible for elevating them?
Which muscle in the lower leg attaches to the ankle and flexes the foot?
Which muscle in the lower leg attaches to the ankle and flexes the foot?
What type of muscle movement does the deltoid muscle primarily perform?
What type of muscle movement does the deltoid muscle primarily perform?
What is the role of Ca2+ in the process of muscle contraction?
What is the role of Ca2+ in the process of muscle contraction?
What happens when acetylcholine binds to receptor sites on Na+ channels during muscle contraction?
What happens when acetylcholine binds to receptor sites on Na+ channels during muscle contraction?
Which organelle releases stored calcium in response to Na+ entering the postsynaptic terminal during muscle contraction?
Which organelle releases stored calcium in response to Na+ entering the postsynaptic terminal during muscle contraction?
What is the role of ATP in muscle contraction?
What is the role of ATP in muscle contraction?
What causes tropomyosin to move and expose attachment sites for myosin during muscle contraction?
What causes tropomyosin to move and expose attachment sites for myosin during muscle contraction?
What causes muscle contraction to stop?
What causes muscle contraction to stop?
