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How do the Gastrointestinal, Cardiovascular and Respiratory systems help muscle cells

How do the Gastrointestinal, Cardiovascular and Respiratory systems help muscle cells carry out their job roles? I need to write about each system alone in under 100 words each.

Thanks!
Hi,

Are you at Uni? What degree is this for, [so I can give you the right level of detail]?
[Anyway, I shall provide brief info whatever you study]
A. GI tract: a) Provide substrate for energy i.e.
-----i) glucose to skeletal muscle [mainly];
-----ii) plus for storage as glycogen [remember muscle cell stores glycogen as dense particles]
-----iii) fatty acids to cardiac muscle
b) Other nutrients
-----i) Absorbed Ca++ initiates transmission of impulse at neuromuscular junction by sparking off the electrical/contraction coupling.
-----ii) Provides the nutrients required for synthesis of ACh [acetyl groups [CH3COO-] to make acetyl coenzyme
A]
-----iii) Supply of amino acids to synthesize actin, myosin, troponin + tropomyosin.

B. CVS:
a) Blood supply to muscle to carry over nutrients + O2 + Ca++
b) Remove CO2 + lactic acid [latter for anaerobic [resp-n]
c) Control of both the above as per requirement e.g. increased demand during exercise [mediated by vasodilatation of muscle arterioles by stimulation of beta-2 adrenoceptors by NA]; increased cardiac output mediated by stimulation of beta-1 adrenoceptors, etc.

C. Respiratory syst:
a) Supply of O2 precisely as needed e.g. [mention VO2max] tachypnoea + increased depth of ventilation during exercise.
b) [jointly c B above]: sigmoid curve of graph of O2 saturation [y axis] against pO2 [x axis] means O2 supplied as necessary.
c] Efficient gas exchange to meet demands of muscle cells e.g. single squamous cell capillary wall + thin alveolar wall -----> fast diffusion
d] Erythrocyte diameter [7 microns] about the same as capillary diameter ---->
-----(i) short distance for diffusion of O2
-----(ii) erythrocytes move slowly so enough time for gas exchange.

Just expand on on these points and your examiner will sing "Happy" by Phil Pherell!! :colondollar:

M [specialist biology tutor]
Reply 2
Original post by macpatgh-Sheldon
Hi,

Are you at Uni? What degree is this for, [so I can give you the right level of detail]?
[Anyway, I shall provide brief info whatever you study]
A. GI tract: a) Provide substrate for energy i.e.
-----i) glucose to skeletal muscle [mainly];
-----ii) plus for storage as glycogen [remember muscle cell stores glycogen as dense particles]
-----iii) fatty acids to cardiac muscle
b) Other nutrients
-----i) Absorbed Ca++ initiates transmission of impulse at neuromuscular junction by sparking off the electrical/contraction coupling.
-----ii) Provides the nutrients required for synthesis of ACh [acetyl groups [CH3COO-] to make acetyl coenzyme
A]
-----iii) Supply of amino acids to synthesize actin, myosin, troponin + tropomyosin.

B. CVS:
a) Blood supply to muscle to carry over nutrients + O2 + Ca++
b) Remove CO2 + lactic acid [latter for anaerobic [resp-n]
c) Control of both the above as per requirement e.g. increased demand during exercise [mediated by vasodilatation of muscle arterioles by stimulation of beta-2 adrenoceptors by NA]; increased cardiac output mediated by stimulation of beta-1 adrenoceptors, etc.

C. Respiratory syst:
a) Supply of O2 precisely as needed e.g. [mention VO2max] tachypnoea + increased depth of ventilation during exercise.
b) [jointly c B above]: sigmoid curve of graph of O2 saturation [y axis] against pO2 [x axis] means O2 supplied as necessary.
c] Efficient gas exchange to meet demands of muscle cells e.g. single squamous cell capillary wall + thin alveolar wall -----> fast diffusion
d] Erythrocyte diameter [7 microns] about the same as capillary diameter ---->
-----(i) short distance for diffusion of O2
-----(ii) erythrocytes move slowly so enough time for gas exchange.

Just expand on on these points and your examiner will sing "Happy" by Phil Pherell!! :colondollar:

M [specialist biology tutor]

Hello, thank you for replying! this is for a-level grade assessment in biology/physiology :smile: thank you!
Reply 3
Hey did u manage to answer this question?
I got same question :frown:
Original post by Hops23
Hey did u manage to answer this question?
I got same question :frown:

check my answer above!
Reply 5
Original post by macpatgh-Sheldon
check my answer above!

Couldn’t understand 🥲 sorry

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