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Answer :

Jenaaaaaaaaaaago
1. Hemoglobin uses quaternary as its protein structure. (quaternary structure)

2. Iron is important in the structure of haeonglobin because it’s the iron atom that binds oxygen as the blood travels between the lungs and the tissues.

3 and 4( i’m not sure about this one but i hope this will help))

The inner surface of the alveolus is lined by a special type of alveolar cell called a pneumocyte

Type I pneumocytes are very thin in order to mediate gas exchange with the bloodstream (via diffusion)
Type II pneumocytes secrete a pulmonary surfactant in order to reduce the surface tension within the alveoli

Alveolar air spaces are surrounded by a dense network of capillaries, which transport respiratory gases to and from the lungs

The capillaries are located close to the pneumocytes and are composed of a very thin, single-layer endothelium
The capillaries transport oxygen within red blood cells, while white blood cells may extravasate into the lung tissue.



i hope this will help u since it took some time but goodluck!!! :)
View image Jenaaaaaaaaaaa

answer:  1:In fact, hemoglobin is composed of four globin proteins—two alpha chains and two beta chains—each with a heme group. The heme group contains one iron atom, and this can bind one molecule of oxygen. Because each molecule of hemoglobin contains four globins, it can carry up to four molecules of oxygen.

2:It is the iron atom that binds oxygen as the blood travels between the lungs and the tissues. There are four iron atoms in each molecule of hemoglobin, which accordingly can bind four molecules of oxygen.

3:Human red blood cells are sometimes suggested as an exception to the cell theory because they have no nucleus, but nuclei are present as they form, and red blood cells of other animals do have nucleis.The biconcave shape of the cell allows oxygen exchange at a constant rate over the largest possible area. ... Learn about red blood cells (erythrocytes) by watching them move through arteries and capillaries. As the cells move through the capillaries, they deliver oxygen to the surrounding tissues.

4:The major cell types are the epithelial type I and type II cells, the pulmonary endothelial cells, interstitial cells, and macrophages. Type I cells constitute 8–11% of all cells found in the alveolar region and type II epithelial cells constitute 13–16%.

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