Podcast
Questions and Answers
What characterizes the latch bridge mechanism in smooth muscle contraction?
What characterizes the latch bridge mechanism in smooth muscle contraction?
- Enhances ATP binding affinity to myosin head
- Phosphorylation of myosin light chain kinase
- Rapid removal of myosin heads from actin
- Leaves myosin head bound to actin without Pi (correct)
In the smooth muscle contraction cycle, what causes muscle relaxation?
In the smooth muscle contraction cycle, what causes muscle relaxation?
- Binding of myosin heads to actin
- Phosphorylation of actin filaments
- Activation of myosin ATPase
- Removal of calcium and phosphate by phosphatase (correct)
What is the function of the latch bridge cycle in smooth muscle contraction?
What is the function of the latch bridge cycle in smooth muscle contraction?
- Increases ATP consumption
- Reduces energy consumption by maintaining tension (correct)
- Shortens the period of tension
- Enhances speed of muscle relaxation
How does the latch bridge mechanism contribute to tonic contraction in smooth muscle?
How does the latch bridge mechanism contribute to tonic contraction in smooth muscle?
What is the primary role of phosphatase in the smooth muscle contraction cycle?
What is the primary role of phosphatase in the smooth muscle contraction cycle?
What is the term for the swelling of a neuron where neurotransmitter is stored?
What is the term for the swelling of a neuron where neurotransmitter is stored?
Which neurotransmitters are released by autonomic nerves?
Which neurotransmitters are released by autonomic nerves?
In smooth muscles, which type of system is associated with norepinephrine?
In smooth muscles, which type of system is associated with norepinephrine?
Which type of smooth muscle can contract in response to stretch?
Which type of smooth muscle can contract in response to stretch?
What is the purpose of having gap junctions in single-unit smooth muscles?
What is the purpose of having gap junctions in single-unit smooth muscles?
What is the role of dense bodies in smooth muscles?
What is the role of dense bodies in smooth muscles?
How are neurons connected to smooth muscles?
How are neurons connected to smooth muscles?
What is a key characteristic of autonomic neurons at the junction of smooth muscles?
What is a key characteristic of autonomic neurons at the junction of smooth muscles?
Where are smooth muscles mainly located in vessels?
Where are smooth muscles mainly located in vessels?
How do contractions of smooth muscles compare to skeletal muscles?
How do contractions of smooth muscles compare to skeletal muscles?
What are the two types of cholinergic receptors?
What are the two types of cholinergic receptors?
Where are alpha 2 receptors primarily found?
Where are alpha 2 receptors primarily found?
What is the primary action of alpha 1 receptors?
What is the primary action of alpha 1 receptors?
Which neurotransmitters do beta 2 receptors respond to mainly?
Which neurotransmitters do beta 2 receptors respond to mainly?
What is the mechanism of action for removing acetylcholine from a synaptic cleft?
What is the mechanism of action for removing acetylcholine from a synaptic cleft?
