Top Posters
Since Sunday
26
21
21
21
20
19
19
19
18
18
18
18
New Topic  
wrote...
Posts: 8
Rep: 0 0
6 months ago
hi there! just a couple questions here about the nervous system and senses.

1. a nerve impulse is best described as
A the diffusion of molecules along the neutron after the molecules have been released from the dendrites
B a result of a change in osmotic pressure between the inner and outer surfaces of the neural membrane
C an enzymatic reaction that makes the membrane more permeable to potassium ions
D an electrochemical process that occurs along the neural membrane.
i think it’s D but i’m not sure

2. transmission of a nerve impulse depends primarily on the stimulus
A increasing the neurons permeability to potassium ions and thus allowing these ions to enter the neuron
B decreasing the potassium ions and thus allowing these ions to leave the neuron
C increasing the neurons permeability to sodium ions and thus allowing these ions to enter the neuron
D decreasing the sodium ions and thus allowing these ions to leave the neuron
Read 91 times
3 Replies
Replies
Answer accepted by topic starter
wrote...
Educator
Top Poster
Posts: 24965
6 months ago
Sign in or Sign up in seconds to unlock everything.
1. a nerve impulse is best described as A the diffusion of molecules along the neutron after the molecules have been released from the dendrites B a result of a change in osmotic pressure between the inner and outer surfaces of the neural membrane C an enzymatic reaction that makes the membrane more permeable to potassium ions D an electrochemical process that occurs along the neural membrane. i think it’s D but i’m not sure

(D)

 
2. transmission of a nerve impulse depends primarily on the stimulus A increasing the neurons permeability to potassium ions and thus allowing these ions to enter the neuron B decreasing the potassium ions and thus allowing these ions to leave the neuron C increasing the neurons permeability to sodium ions and thus allowing these ions to enter the neuron D decreasing the sodium ions and thus allowing these ions to leave the neuron

Similar to the muscle Na+ (sodium) needs to enter for the cell to transmit a signal (contraction) and K (potassium) exits the muscle to relax.

(increasing the neurons permeability to sodium ions and thus allowing these ions to enter the neuron.)

Good way to remember this is that in dead people potassium (K) reenters the muscles and sodium leaves this causes rigor mortis (stiffness after death).
This verified answer contains over 270 words.
1
The best way to say thank you is with a positive review:

  https://trustpilot.com/review/biology-forums.com 

Your support goes a long way!


Make a note request here
Related Topics
wrote...
6 months ago
thank you!!
 Face with Stuck-out Tongue
wrote...
Educator
6 months ago
 Thumbs Up Sign Anything else, don't be shy to ask
The best way to say thank you is with a positive review:

  https://trustpilot.com/review/biology-forums.com 

Your support goes a long way!


Make a note request here
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers.
Learn More
Improve Grades
Help Others
Save Time
Accessible 24/7
  102 People Browsing
Your Opinion
What's your favorite coffee beverage?
Votes: 64

Related Images
 954
 1971