Question

http://prntscr.com/9a3qpj

What does the data in this graph suggest about the rate of respiration?

Heat production increases as muscle tension increases.
Heat production is the highest near the low point of muscle tension.
Heat production is constant in a contracting muscle.
Heat production is not related to muscle tension.

I'm thinking B...

Answer 1

@pooja195

Answer 2

where is the graph

Answer 3

it's linked as the first thing on the question...

Answer 4

sorry I just saw that, but B is in fact correct :)

Answer 5

how do you know?

Answer 6

Well I know that it is not A just by looking at the graph

Answer 7

well, A is not correct, as heat production drops at various points while muscle tension increases

Answer 8

And the heat production isn't constant because it drops and raises itself.

Answer 9

C is incorrect because it is not constant

Answer 10

and it isn't C because the heat production is not constant as muscle tension increases

Answer 11

and D is not correct because heat production is in fact highest near the low point of muscle tension

Answer 12

Hope this helped :)

Answer 13

uh, D is arguable. heat production is low at the tail end of the cycle where the tension is also just as low as it was when the heat production was high

Answer 14

I think they're related in some way, but I can't find it... I mean, there's a correlation in that they both fall drastically near the end of the the chart.

Answer 15

I think the answer is D, that the heat production is NOT related to muscle tension, because for many values of muscle tension, we can find heat production to be high or low, depending on the time in the contraction

Answer 16

Hm, that does make sense.
So how do you disprove B then?

Answer 17

look where the heat production is highest. what is the muscle tension there? now find another spot on the graph with lower muscle tension and lower heat production. if you can find one, then heat production is not the highest near the low point of muscle tension.

Answer 18

Oh, I totally missed the lower muscle tension point on the graph. Thanks for pointing that out or I would've gotten this wrong.

Answer 19

heat production is high between the spots where muscle tension is between 2 and 3 ticks on the left hand scale, right? well, if you look at the curve for muscle tension, most of the graph has lower muscle tension than that area...and the heat production is lower in that other portion of the graph, too

Answer 20

I think the rough mental model here is that the muscle cell contracts and does a bunch of work right away, generating heat, but it can't continue to contract with increasing tension for long, and is exhausted, and doesn't create much heat while whimpering in pain :-)

Answer 21

That's a good way to view it, I hadn't thought of it.
Thanks for all your help :)

Answer 22

I hope it is correct :-) But looking at the graph, it seems hard to accept B as true...

Answer 23

Yeah, now that you pointed that out for me, B does look incorrect.

Answer 24

shoot me a message or post back here when you find out the answer, ok?

Answer 25

I will, definitely. It's my anatomy final so I just hope I get a good grade.

Answer 26

This was wrong...