Zoology Assignment Help >> Formation of oxyhaemoglobin in lungs, Dissociation of oxyhaemoglobin

Formation of oxyhaemoglobin in lungs: Oxygen is mainly transported as oxyhaemoglobin.

1. This combination of oxygen and haemoglobin is a reversible process.

2. This is done by substituting the terminal NH2 groups and amidazole group from Hb by oxygen. This is not an oxidation reaction.

3. This is loose covalent bonding.

4. There must be four iron atoms in each molecule of haemoglobin.



This dissociation of oxyhaemoglobin is facilitated by-

1. pH of blood (7.4)

2. Low temperature in lungs

3. Partial pressure of O₂ and CO₂

Dissociation of oxyhaemoglobin:

1. Dissociation of oxygen from

oxyhaemoglobin and entering of CO2 from tissue into lungs occurs due to relatively higher pH of blood in tissue.

2. Higher temperature in tissue

3. Partial pressure of O₂ and CO₂ Tissue





LARYNX (ORGAN OF SOUND PRODUCTION)

Skeletal framework-Wall of the larynx is supported by four cartilages.

1. Thyroid cartilage-It is anterior ¬most and broadest cartilage. Midventral protruberance of this cartilage is called Adam's apple.

2. Cricoids cartilage-Smaller, thicker and complete ring like cartilage behind thyroid cartilage.

3. Arytenoid cartilage-Paired small cartilages along sides of larynx. Its swollen knob is called cartifage of Santorini.

Sound is produced by the process of resonance produced by flow and pressure of air.

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