Question

HELP!!! Can someone please help me with these questions related to the nervous system.

Answer 1

Here are my answers:
a) tendon
b) structure E
c)structure F
d)
e)
Can you tell me if im on the right track

Answer 2

For d) if you know what structure E is, then if you are also allowed to go back in your textbook, look up the name of structure E and see if you can find information on it.
For e) if you know how long the reflex arc is, you should be able to calculate the answer. Hope this helps!

Answer 3

my teacher said the length of the reflex arc depends because if its a child, it will be smaller but if its an adult it will be larger. So there is no length set in stone. Whatever number I choose for d should be used to help me answer question e

Answer 4

I think the answer for c) is A

Answer 5

Here, this information might help you: http://michaeldmann.net/mann15.html

Answer 6

thanks I'll check it out

Answer 7

is there a more simpler explanation

Answer 8

I think the place to start is by identifying the structures. This discussion would make more sense if we talked about it in terms of tendons and neurons, not Structure A and so on.

I think you have correctly identified the tendon - do you know what the other structures are?

Answer 9

A is quadricep muscle
B is receptor
C is effector
D is sensory nerve fibre
E is motor nerve fibre
@blues

Answer 10

It is indeed. :)

So question b asks for the structure that carries info away from the spinal cord. As in, from the spinal cord back to the joint. You know that nerve fibers carry info, so your choice becomes either the sensory nerve, or the motor nerve.

And the sensory nerve carries info from the joint, to the spinal cord. Precisely opposite direction than the question asks.

So for B, I like structure E, which is the motor nerve fiber.

Answer 11

I left out Structure F. STructure f is hamstring muscle @blues

Answer 12

:) It is indeed. Do you have any ideas about what might a plausible answer for question C - what structure shortens in response?

Answer 13

The quadricep muscle

Answer 14

:) That is absolutely correct.

The next question is really inexact. It's talking about the sensory nerve fiber that goes from the knee to the spinal cord. Which varies greatly in length, depending on how old/long legged the human in question is.

But If I had to guess, I'd say a human thigh is 1.5 feet long, along which the nerve fiber runs, and maybe another 10 inches from the top end of the thigh to where the fiber runs into the spine?

So I'd guess a little more than 2 feet in all?

I'm sorry that's the best I can do. ; (

Answer 15

so assuming we go with 60 how would we use that to work question e

Answer 16

2 ft is equivalent to .6 meters

Answer 17

All we need to do is some math.

So the reflex arc is the distance in nerve fiber from the joint to the spine and back to the joint. Just from the joint to the spine is about 0.6 meters, so back again is twice that. 2 x 0.6 = 1.2 meters.

That is the first part.

The next part is to set up a proportion. It tells us that the impulse travels at 100 meters per second. So the equation looks like:

\[1 second / 100 meters = ?? seconds / 1.2 meters\]

You are trying to solve for ?? seconds, so you multiply both sides by 1.2 meters:

\[(1 second / 100 meters) * 1.2 meters = ?? Seconds\]

And if you do the math, you get 1.2 / 100 = 0.012 seconds.

Roughly.

Take your time with that and tell me if it makes sense to you. :0

Answer 18

yeah makes since

Answer 19

so i wanna use the number 35 for my question. I'll work it out using the way you just showed and then you can tell me if its right and I will truly be able to see if i understand?

Answer 20

btw my teacher told us to us cm so ill use cm instead of ft

Answer 21

OK, cool. :)

Answer 22

from the thigh to spinal cord is 35cm

Answer 23

from the spinal cord back to thigh is 35 again. Double it and I get 70

Answer 24

70 cm is equivalent to .7m

Answer 25

:) Good so far.

Answer 26

when I do formula at the end I get .007s

Answer 27

And I think that is correct. :)

Thank you for working through the problem, not just demanding answers! I really, really appreciate it.

Answer 28

no problem and thank you for your help

Answer 29

It's what I'm here for. :)