18 Questions
What is the purpose of the refractory period in neurons?
To ensure an action potential can only pass in one direction
Which principle states that an action potential is either produced or not, with all action potentials being of the same strength?
All-or-nothing principle
How do synapses prevent action potentials from going in the wrong direction?
By having neurotransmitter made only in the presynaptic neurone
What is summation in synaptic transmission?
Releasing neurotransmitter to reach the threshold value
What is a role of excitatory synapses?
Facilitate the firing of action potentials
In synaptic transmission, what can spatial summation involve?
Multiple presynaptic neurones releasing neurotransmitter
What is the function of rod cells in the eye?
They provide low visual acuity in low light conditions
Which region of the heart is referred to as the pacemaker?
Sinoatrial node
Why do ventricles start contracting after the atria in the heart?
Tissue at the base of the atria delays the wave of excitation
What is the role of the bundle of His in heart conduction?
Carrying the wave of excitation to the apex of the heart
Which part of a nerve reflex arc is responsible for transferring signals from one neuron to another?
Synapse
What is responsible for the myogenic nature of the heart's contraction?
Sinoatrial node
What is the correct sequence of components in a general reflex arc?
Receptor, Sensory Neurone, Intermediate Neurone, Motor Neurone, Effector
What is the role of an Intermediate Neurone in a reflex arc?
Relays the nerve impulse from the sensory neurone to the motor neurone
Which type of receptor detects changes in light?
Photoreceptors
Where are Pacinian Corpuscles mostly found in the body?
Fingers and Soles of the feet
What happens to stretch mediated sodium channels in a Pacinian Corpuscle under pressure?
They open
Which part of a simple reflex arc carries the nerve impulse from the spinal cord to the effector?
Motor Neurone
Test your knowledge on the reflex arc and the different types of neurones involved in fast responses. Understand the pathway from stimulus to response through receptor, sensory neurone, intermediate neurone, motor neurone, and effector.
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