Neuroscience and Cardiovascular Physiology Quiz

What is the functional unit of the nervous system?

• Soma

• Neuron

• Axon

• Synaptic knobs

What type of nerve fibers are characterized by a myelin sheath?

• Unmyelinated

• Sensory

• Myelinated

• Motor

What is the resting membrane potential of a neuron?

• -70 mv

• -90 mv

• +30 mv

• 0 mv

What phase follows complete depolarization in action potential?

• Repolarization

• Hyperpolarization

• Resting phase

• Threshold

What is released at the neuromuscular junction to initiate muscle contraction?

• Serotonin

• Norepinephrine

• Dopamine

• Acetylcholine

What is the primary function of the atrioventricular valves?

• Prevent backflow of blood

• Facilitate gas exchange

• Increase heart rate

• Regulate blood pressure

What is the primary effect of sympathetic stimulation on heart rate?

• Increases heart rate

• Decreases heart rate

• No effect

• Irregular heart rate

What is the term for the ability of the heart to beat independently of nerve supply?

• Contractility

• Excitability

• Rhythmicity

• Conductivity

What is the primary ion involved in cardiac muscle contraction?

• Chloride

• Sodium

• Potassium

• Calcium

What is the effect of acetylcholine on heart rate?

• Decreases heart rate

• Increases heart rate

• No effect

• Irregular heart rate