Podcast
Questions and Answers
What is the role of mucopolysaccharides within the T tubules of cardiac muscle fibers?
What is the role of mucopolysaccharides within the T tubules of cardiac muscle fibers?
- Binding calcium ions (correct)
- Regulating potassium ion concentration
- Generating action potentials
- Facilitating sodium ion diffusion
Why does a heart placed in a calcium-free solution stop beating?
Why does a heart placed in a calcium-free solution stop beating?
- The sodium-calcium exchanger malfunctions
- T tubules allow percolation of extracellular fluid containing calcium ions (correct)
- The sarcoplasmic reticulum is unable to release calcium ions
- Cardiac muscle fiber contraction depends on calcium ion concentration
How does the strength of cardiac muscle contraction relate to extracellular fluid calcium concentration?
How does the strength of cardiac muscle contraction relate to extracellular fluid calcium concentration?
- It remains unaffected by changes in calcium concentration
- It is greatly influenced by extracellular fluid calcium concentration (correct)
- It depends on the level of sodium-potassium ATPase pump activity
- It is solely dependent on intracellular calcium levels
Why is skeletal muscle contraction less affected by changes in extracellular fluid calcium concentration compared to cardiac muscle contraction?
Why is skeletal muscle contraction less affected by changes in extracellular fluid calcium concentration compared to cardiac muscle contraction?
How are calcium ions removed from cardiac muscle cells?
How are calcium ions removed from cardiac muscle cells?
What is the main difference in calcium ion release between skeletal muscle and cardiac muscle?
What is the main difference in calcium ion release between skeletal muscle and cardiac muscle?
What triggers the release of calcium into the sarcoplasm in cardiac muscle?
What triggers the release of calcium into the sarcoplasm in cardiac muscle?
Why would the strength of cardiac muscle contraction be reduced without calcium from the T tubules?
Why would the strength of cardiac muscle contraction be reduced without calcium from the T tubules?
What is the role of troponin in initiating contraction in both skeletal and cardiac muscles?
What is the role of troponin in initiating contraction in both skeletal and cardiac muscles?
What happens when voltage-dependent calcium channels in T tubules open during an action potential?
What happens when voltage-dependent calcium channels in T tubules open during an action potential?
Why are the T tubules in cardiac muscle larger in diameter compared to those in skeletal muscle?
Why are the T tubules in cardiac muscle larger in diameter compared to those in skeletal muscle?
