What is the role of villi in the absorption of food? Differentiate between absorption and assimilation.

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Solution

Villi:
Villi are small finger-like projections found on the surface of the small intestine that assist in the absorption of digested food.
There are numerous villi spread all across the inner wall of the small intestine.
The villi are known to provide more surface area within the small intestine for better absorption of the broken down digested food into the blood.
Absorption: In this process, the digested food within the small intestine is now transported to the blood via the help of villi on the inner walls of the small intestine.
Assimilation: The digested food absorbed by the blood via villi is then carried to all the cells of the body. In these cells, digested food is burnt in order to produce energy for the functioning of the body, and this entire process is known as assimilation.
Absorption
Assimilation
1. This takes place between the small intestine and the blood vessels. 1. This involves blood in the blood vessels and the tissues throughout the body.
2. This process is necessary for the assimilation of digested food. 2. This process is necessary for respiration to begin for obtaining energy from the food.
3. It is performed by the villi in the small intestine. 3. It is performed by the blood cells within the blood vessels.

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The correct order of steps occurring in nutrition in animals is :

(a)Ingestion $\to$ Absorption $\to$ Digestion $\to$ Assimilation $\to$ Egestion
(b)Ingestion $\to$ Digestion $\to$ Assimilation $\to$ Absorption $\to$ Egestion

(c)Ingestion $\to$ Digestion $\to$ Absorption $\to$ Assimilation $\to$ Egestion
(d) Ingestion $\to$ Assimilation $\to$ Digestion $\to$ Absorption $\to$ Egestion

Q. The correct order of steps occurring in nutrition in animals is:
(a) Ingestion → Absorption → Digestion → Assimilation → Egestion
(b) Ingestion → Digestion → Assimilation → Absorption → Egestion
(c) Ingestion → Digestion → Absorption → Assimilation → Egestion
(d) Ingestion → Assimilation → Digestion → Absorption → Egestion

Differentiate between absorption and assimilation.

Q. Differentiate:
absorption and assimilation
RBCs and WBCs

What is the difference between absorption and assimilation?

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Absorption	Assimilation
1. This takes place between the small intestine and the blood vessels.	1. This involves blood in the blood vessels and the tissues throughout the body.
2. This process is necessary for the assimilation of digested food.	2. This process is necessary for respiration to begin for obtaining energy from the food.
3. It is performed by the villi in the small intestine.	3. It is performed by the blood cells within the blood vessels.