Circulatory/Respiratory System Question

[cobby]

Can someone please explain what residual volume is?
An the pathway of oxygenated/deoxgynated blood through the heart?...im having difficulty unsdertsanding this concept

[Stephanie]

Residual volume is the amount of air left in the lungs after a maximal exhalation. So you can try it yourself, you can exhale as much as you can in one expiration and you will still have air sitting at the bottom of your lungs and can still breathe out, after that maximal exhalation without inhaling more air. As for the pathway of oxygenated and deoxygenated blood through the heart, i think i might have some concept maps on the computer at school that i had to do last year, which ill see if i can upload when i go back next week, but for now this diagram isnt too bad. http://www.biomed.metu.edu.tr/courses/term_papers/artificial-hearts_gokduman_files/image002.gif

I love p.e so i hope i can be of some help

[cobby]

Residual volume is the amount of air left in the lungs after a maximal exhalation. So you can try it yourself, you can exhale as much as you can in one expiration and you will still have air sitting at the bottom of your lungs and can still breathe out, after that maximal exhalation without inhaling more air. As for the pathway of oxygenated and deoxygenated blood through the heart, i think i might have some concept maps on the computer at school that i had to do last year, which ill see if i can upload when i go back next week, but for now this diagram isnt too bad. http://www.biomed.metu.edu.tr/courses/term_papers/artificial-hearts_gokduman_files/image002.gif

I love p.e so i hope i can be of some help

Thank you, i take it in that diagram the blue portion is the deoxygentated blood?, please notify me when u get those concept maps please it would be greatly appreciated

[Stephanie]

yea the blue is the deoxygenated blood path

[cobby]

yea the blue is the deoxygenated blood path

Also would u be able to tell me if there are any other ways that heat is elimintaed from the ATP breakdown cycle, other than sweating and respiration?

[Stephanie]

no that would be all that i can think of. What txt book do you have? And you're in year 11 yeah?
 

[cobby]

yeh im in yr 11 we're using nelson p.e Unit 1/2, any recommendations on better books? regarding units 3/4

[Stephanie]

nah im in year 12 and we use nelson and i think its the best book going around, just because next year you will have to learn the stages of the of ATP breakdown and resynthesis in alot more detail not just in general like you do in year 11

[cobby]

next year you will have to learn the stages of the of ATP breakdown and resynthesis in alot more detail not just in general like you do in year 11

Cant wait!, how have u gone on ur SAC's throughout the year so far?

[Stephanie]

Well so far for unit 4 my lowest mark was like 92% or something but for unit 3 i think i averaged about 78-80% overall which according to vcaa is like a B+ so i guess not too bad but im planning on killing the exam so hopefully my ss shouldnt be too bad after they scale it down by like 5! With P.E its not that its hard or anything its pretty interesting but you cant really rope learn anything, everything is applied knowledge. Everything kinda links, no topic is really separate from another so when you study for sacs you have to know one topic in detail but still have a very very good memory of previous topics which can be kinda annoying. how you finding it?

[cobby]

Well atm, yr 11 is really cruisy, had a circulatory/respiratory test on the last week of term i think i got about 75%, wasnt overly disappointed with that, now first week back we've got a test on energy systems, do u mind shedding some light on what u believe are the key concepts for this topic?

[Stephanie]

With energy systems the thing you have to remember and what they keep drilling into people yet assessment reports still state that people dont quite understand, is the fact that all three energy systems are activated at the start of physical activity and that one just doesnt turn off or on, one just takes over and becomes the dominant ATP provider, even a 100m sprinter uses their aerobic system i thinks its about 3% or something but dont quote me on that. having any difficulties with any part of it???

[cobby]

umm well i dont quite understand the points at which each system takes over from the others respectively, the book doesnt quite explain at which point they over-ride each oher?

[transgression]

This is the energy system Interplay, where in the first 0-10 seconds, the most dominant system is the ATP-PC system. After this, the LA system becomes the dominant system as the PC stores are generally depleted. The aerobic system kicks in during the 60-75 second mark, as a consequence of the longer duration of the exercise/activity.

It is important to note that one system will become DOMINANT than the others during a particular time.

[Stephanie]

The ATP-PC system is dominant for about the first 7 seconds - some text books say up to 10 seconds but nothing higher than that, The Lactic acid system is the dominant provider from then on till it fatigues at about 2-3mins, and the aerobic system becomes increasingly dominant as the lactic acid system fatigues. It all depends on the intensity of the activity - anything about 85% of max heart rate is an anaerobic activity. But with an aerobic activity like a marathon or 1500m swim or something just because the anaerobic systems cant be the main ATP providers due to the intensity of the activity and the fact they are pretty much depleted, doesnt mean they can contribute. Like at the end of a 1500m swim say the last 25meters although it is still an aerobic activity the lactic acid system would fuel that burst as the intensity is increased. Am i confusing you? i cant remember how much detail you need to know for year 11. sorry if you have no idea what im talking about