Ch#14 | Lec #22 | TRANSPORT IN MAN: (Blood Plasma )(FSc Bio part 1)@riffatjahan

TRANSPORT IN MAN:
In humans, in addition to blood circulatory system, there is also another transport system, the lymphatic system.
Blood Circulatory System:
The circulatory system of humans have three basic components.
(a) Circulatory fluid - the blood.
(b) Pumping Organ - The Heart
(c) Pumping Vessels - The Arteries, Capillaries and Veins.
(a) Circulatory Fluid - The Blood:
The blood is the medium in which dissolved nutrients, gases, hormones and wastes are transported through the body.
The weight of the blood in our body 1/12th of our body,
Blood is divided into two main parts.
(i) Plasma: 55% by volume
(ii) Cell and cell-like bodies: 45% by volume
(i) Plasma: (55% of blood by volume)
Plasma is primarily water in which proteins, salts, nutrients and wastes ard dissolved.
Water constitutes about 90% of plasma and 10% are dissolved substances.
Most of the dissolved substances are maintained at a constant or nearly constant level but others occur in varying concentration.
1. Inorganic Ions or Mineral Ions:
The inorganic ions and salts make up 0.9 percent of the plasma of humans by weight more than two thirds of this amount is sodium the ordinary table salt.
Even if the total concentration of dissolved substances remains the same shifts in the concentration of particular ion can create serious disturbances.
The normal pH of human blood is 7.4 and it is maintained between narrow limits, because the change in pH would affect the chemical reactions of the body.
2. Plasma Proteins:
The plasma protein constitute 7-9 percent by weight of the plasma.
Most of these proteins are synthesied in the liver.
Some of the Globulins, called immunoglobulins or antibodies, are produced in the response to antigens, by lymphocytes cells, and then are passed to plasma, and lymph.
The proteins like prothrombin acts as a catalyst in blood clotting process, Fibrinogen takes part in the blood clotting process.
Immunoglobulins play important role in body's defenses against disease.
3. Organic Nutrients:
The organic nutrients in the blood include, glucose, fats, phospholipids, amino acids and lactic acids, Some of them enter the blood after absorption from the intestine.
Lactic acid is produced in muscles as a result of glycolysis, and is transported by blood to liver.
Cholesterol is an important constituent: It is metabolized to some extent but also serves an precursor of steroid hormones.
4. Nitrogenous Waste Products:
The nitrogenous waste products are formed as a result of cellular metabolism is urea amount of uric acid.
These products are carried from the liver where they are produced, to the organs from where they are removed i.e. kidneys. 5.Hormones: All the Hormones in the body are carried by blood so they are present in the plasma and are transported to the target cells for specific responses.
6. Respiratory Gases: The respiratory gases such as carbon dioxide and oxygen are present in the plasma of the blood
.
And If you like the video. Please like, share and subscribe channel. Thank you for watching my video. @riffatjahan channel Link... / @rffatjahan

[@Passiongrow21]

Excellent 👌 work mam

[@riffatjahan]

Thanks a lot