Name: Pulmonary Air Volumes and Lung Capacities
Uploaded: 2019-07-19
Duration: 4 min 33 s
Description: During normal breathing, we inhale about 500ml of air. During forceful breathing, we can inhale an extra amount of air. What's the maximum air volume that ou...

Question

Draw a cyclic chart of Kreb's cycle and explain its reactions from pyruvic acid up to 5-carbon containing acid formation.

Accepted Answer

The Krebs cycle is a part of aerobic respiration. Aerobic respiration is the process that occurs in the presence of oxygen to convert food into carbon dioxide, water and energy. Kreb’s cycle is also called the Citric acid cycle or TCA (tricarboxylic acid) cycle.

Since Kreb’s cycle is a cyclic process, the Oxaloacetate formed at the end of this cycle combines with the acetyl-coenzyme A in the next cycle. At each turn of Krebs cycle, the following energy molecules are produced as:
3 NADH, 1 FADH₂, 1 GTP or ATP and 2 Carbon dioxide molecules.

Pyruvic acid to a 5-carbon molecule:

$P y r u v i c a c i d \to_{C o e n z y m e A ↑ C O_{2} ↓}^{N A D^{+} ↪ N A D H} A c e t y l C o A \overset{C i t r a t e s y n t h e t a s e}{\to} C i t r a t e \overset{C i s a c o n i t a s e}{\to} I s o c i t r a t e \to_{C O_{2} ↓ N A D^{+} ↪ N A D H}^{I s o c i t r a t e d e h y d r o g e n a s e} α - k e t o g l u t a r a t e (5 - c a r b o n m o l e c u l e)$

Draw a cyclic chart of Kreb's cycle and explain its reactions from pyruvic acid up to 5-carbon containing acid formation.

Important Questions on Breathing and Exchange of Gases

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