Podcast
Questions and Answers
What is responsible for phosphorylating the myosin light chain in smooth muscle cells?
What is responsible for phosphorylating the myosin light chain in smooth muscle cells?
- Actin Activator Enzyme (AAE)
- Calmodulin Phosphatase (CP)
- Myosin Light Chain Kinase (MLCK) (correct)
- Myosin Heavy Chain Kinase (MHCK)
What facilitates the dephosphorylation of the myosin light chain, leading to muscle relaxation?
What facilitates the dephosphorylation of the myosin light chain, leading to muscle relaxation?
- Myosin Light Chain Phosphatase (MLCP) (correct)
- Calmodulin Phosphatase (CP)
- Myosin Heavy Chain Kinase (MHCK)
- Actin Activator Enzyme (AAE)
What initiates the power stroke in smooth muscle contraction?
What initiates the power stroke in smooth muscle contraction?
- ATP-dependent process
- Phosphorylation of myosin light chain
- Calcium binding to calmodulin
- Cross-bridges pulling actin filaments (correct)
How does intracellular calcium concentration increase in smooth muscle cells?
How does intracellular calcium concentration increase in smooth muscle cells?
What regulatory protein does calcium bind to in smooth muscle cells?
What regulatory protein does calcium bind to in smooth muscle cells?
What system innervates smooth muscle, consisting of sympathetic and parasympathetic divisions?
What system innervates smooth muscle, consisting of sympathetic and parasympathetic divisions?
What type of energy is required for the process of smooth muscle contraction?
What type of energy is required for the process of smooth muscle contraction?
What leads to the formation of cross-bridges between the thick and thin filaments in smooth muscle cells?
What leads to the formation of cross-bridges between the thick and thin filaments in smooth muscle cells?
Which neurotransmitter is released from sympathetic nerve terminals to influence smooth muscle contraction?
Which neurotransmitter is released from sympathetic nerve terminals to influence smooth muscle contraction?
What effect does nitric oxide (NO) have on smooth muscle in blood vessels?
What effect does nitric oxide (NO) have on smooth muscle in blood vessels?
Which division of the autonomic nervous system is local to the gastrointestinal tract?
Which division of the autonomic nervous system is local to the gastrointestinal tract?
What hormone can modulate smooth muscle contraction in blood vessels?
What hormone can modulate smooth muscle contraction in blood vessels?
Which hormone can stimulate or inhibit smooth muscle contraction depending on the receptor subtype and tissue involved?
Which hormone can stimulate or inhibit smooth muscle contraction depending on the receptor subtype and tissue involved?
The activation of which enzyme leads to muscle contraction in response to sympathetic stimulation?
The activation of which enzyme leads to muscle contraction in response to sympathetic stimulation?
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