Neuromuscular Junction and Acetylcholine Breakdown

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What enzyme breaks down acetylcholine in the synaptic cleft?

Acetylcholine oxidase

Acetylcholinesterase (correct)

Acetylcholine kinase

Acetyltransferase

In what step does acetylcholine degrade at the neuromuscular junction?

Step 6 (correct)

Step 5

Step 4

Step 3

What happens when acetylcholine binds to its receptor on the ion channel?

Ion channel shrinks in size

Ion channel opens and allows ions to pass (correct)

Acetylcholine breaks down immediately

Ion channel closes stopping ion passage

Which enzyme is involved in ending the effects of acetylcholine?

Acetylcholinesterase Signup and view all the answers

What is the role of acetylcholinesterase in the breakdown of acetylcholine?

It breaks down acetylcholine into its components Signup and view all the answers

What happens to ions when acetylcholine is degraded at the neuromuscular junction?

Ions are blocked from passing through ion channels Signup and view all the answers

Which muscle is the prime mover of plantar flexion in the lower limb?

Soleus Signup and view all the answers

Which muscle is known as the 'toe dancers' muscles due to its involvement in plantar flexion?

Gastrocnemius Signup and view all the answers

Which muscle group is primarily responsible for foot eversion in the lower limb?

Fibularis muscles Signup and view all the answers

What muscle is crucial for toe extension and dorsiflexion of the foot?

Tibialis anterior Signup and view all the answers

Which muscle group is responsible for both dorsiflexion and foot inversion in the lower limb?

Extensor digitorum longus Signup and view all the answers

What muscle is involved in both plantar flexion and foot eversion?

Soleus Signup and view all the answers

What is the primary function of the sarcoplasmic reticulum in a skeletal muscle cell?

Store and release calcium Signup and view all the answers

Which term refers to the ability of muscle cells to be stretched?

Extensibility Signup and view all the answers

What is the zone within the A band of a skeletal muscle that lacks actin filaments?

H zone Signup and view all the answers

Which term refers to the responsiveness of a muscle cell to a stimulus?

Excitability Signup and view all the answers

What is composed of one motor neuron and all the skeletal muscle cells it stimulates?

Motor unit Signup and view all the answers

What serves as the final go signal for muscle contraction?

Calcium Signup and view all the answers