Which of the following rows correctly describe the direction of a nerve impulse in a reflex arc?
Select one:
a. effector → motor neuron → spinal cord → brain → sensory neuron → receptor
b. sensory neuron → brain → motor neuron → effector
c. Receptor → spinal cord → brain → effector
d. sensory neuron → spinal cord → motor neuron → effector
6 years ago
Answered By Carole S
The reflex arc is basically the reaction - or reflex - you get with some external stimuli. So, when you think about how your body reacts to outside stimlu, it might help with figuring out the pathway within the body.
Let's use an example:
Say you burn your arm. You don't feel the pain right away. It takes a small amount of time for your brain to register and react to the fact that you've burnt your arm. Think of the word "receive". That's the root word of receptor. The first thing that happens inside your body is that it receives some information (the stimuli. In this example, the burn) through cells called receptor cells. That is your first point of contact. Next, that information has to travel to your brain. Therefore, the information travels up your body, up your spinal cord, and into the brain. Lastly, the effector produces some sort of response to the information - or, an effect (that's the root word here). In this example, it will contract the muscle in your arm to move it away from the external stimuli, or the thing that is burning your arm.
So, putting it all together, it would go receptor -> spinal cord -> brain -> effector. The answer is c!
6 years ago
Answered By Carole S
The reflex arc is basically the reaction - or reflex - you get with some external stimuli. So, when you think about how your body reacts to outside stimlu, it might help with figuring out the pathway within the body.
Let's use an example:
Say you burn your arm. You don't feel the pain right away. It takes a small amount of time for your brain to register and react to the fact that you've burnt your arm. Think of the word "receive". That's the root word of receptor. The first thing that happens inside your body is that it receives some information (the stimuli. In this example, the burn) through cells called receptor cells. That is your first point of contact. Next, that information has to travel to your brain. Therefore, the information travels up your body, up your spinal cord, and into the brain. Lastly, the effector produces some sort of response to the information - or, an effect (that's the root word here). In this example, it will contract the muscle in your arm to move it away from the external stimuli, or the thing that is burning your arm.
So, putting it all together, it would go receptor -> spinal cord -> brain -> effector. The answer is c!