Podcast
Questions and Answers
What is the functional unit of the myofibril in a cardiac muscle fiber?
What is the functional unit of the myofibril in a cardiac muscle fiber?
- M-line
- Z-line
- Sarcomere (correct)
- I-band
What is the role of the intercalated discs in cardiac muscle fibers?
What is the role of the intercalated discs in cardiac muscle fibers?
- Act as sites for energy production
- Regulate oxygen intake
- Allow for rapid communication between adjacent cells (correct)
- Store excess calcium ions
What gives cardiac muscle fibers their striated appearance?
What gives cardiac muscle fibers their striated appearance?
- Golgi apparatus
- Mitochondria
- Myofibrils (correct)
- Endoplasmic reticulum
How are cardiac muscle fibers different from skeletal muscle fibers?
How are cardiac muscle fibers different from skeletal muscle fibers?
What is the significance of the central nucleus in a cardiac myocyte?
What is the significance of the central nucleus in a cardiac myocyte?
Which cellular structure is responsible for storing and releasing intracellular calcium ions during muscle contraction?
Which cellular structure is responsible for storing and releasing intracellular calcium ions during muscle contraction?
What is the role of tropomyosin in muscle contraction?
What is the role of tropomyosin in muscle contraction?
Which subunit of troponin binds the entire troponin molecule to tropomyosin?
Which subunit of troponin binds the entire troponin molecule to tropomyosin?
What induces a conformational shift in tropomyosin, exposing the active sites on the actin filament?
What induces a conformational shift in tropomyosin, exposing the active sites on the actin filament?
What is the composition of each myosin molecule?
What is the composition of each myosin molecule?
What is the function of the myosin heads during muscle contraction?
What is the function of the myosin heads during muscle contraction?
How does binding of calcium ions contribute to muscle contraction?
How does binding of calcium ions contribute to muscle contraction?
What is the main function of the Transverse (T) tubule in a cardiac myocyte?
What is the main function of the Transverse (T) tubule in a cardiac myocyte?
How does the Transverse (T) tubule contribute to Excitation-Contraction Coupling in a cardiac myocyte?
How does the Transverse (T) tubule contribute to Excitation-Contraction Coupling in a cardiac myocyte?
What is the role of the dilated terminal of the sarcoplasmic reticulum in a cardiac myocyte?
What is the role of the dilated terminal of the sarcoplasmic reticulum in a cardiac myocyte?
Where do 25% of intracellular Calcium ions enter from, in a cardiac myocyte?
Where do 25% of intracellular Calcium ions enter from, in a cardiac myocyte?
What distinguishes the sarcoplasmic reticulum in cardiac muscle from that in skeletal muscle?
What distinguishes the sarcoplasmic reticulum in cardiac muscle from that in skeletal muscle?
How does the wide diameter of the T tubule impact calcium handling in a cardiac myocyte?
How does the wide diameter of the T tubule impact calcium handling in a cardiac myocyte?
