Blood flow - circulation, Biology

Assignment Help:

Blood Flow - Circulation

To understand how blood flows in vessels let us first understand the basic physics of flow in tubes and the special properties of blood as a fluid. The flow of a fluid may be smooth or regular in a straight tube so that each particle moves in a straight line. This is called laminar flow. Blood exhibits a similar kind of flow in the blood vessels.

2285_Blood Flow - Circulation.png

Figure:  Blood velocity is inversely proportional to cross-sectional area at any given point. The velocity is the highest in aorta and falls markedly in capillaries and again increases in vena cava.

Let us first consider the velocity of flow of blood in the vessels. At any point it is not related to the nearness to the heart but to the total cross-sectional area of that part. This cross-sectional area does not refer to that of a single artery or vein or capillary but to the sum of the cross-sections of all the arteries or capillaries of that area. You would have noted that the velocity of water in a river increases as the river narrows, similarly in circulation the maximum velocity occurs where total cross-sectional area is smallest. The arteries have the smallest cross-sectional area and the capillaries have the largest total cross-sectional area.


Related Discussions:- Blood flow - circulation

Dietary management for ulcerative colitis, Q. Dietary Management for ulcera...

Q. Dietary Management for ulcerative colitis? Proper dietary management is important for maintaining a good nutritional status of the patient. Long-term management is generally

Drawbacks of free food items for diabetics patients, Drawbacks of Free Food...

Drawbacks of Free Food Items for diabetics patients In this context, it is important to note that a patient can have unlimited servings of 'free foods'. These are foods which d

Onion cells, What is the process of mitosis in onion root tips in a lab

What is the process of mitosis in onion root tips in a lab

Discuss in detail about the human brain, Discuss in detail about the human ...

Discuss in detail about the human brain  "wiring-up" of our brain begins in early development. When our genetic blueprint largely drives this wiring in womb, a newborn baby's b

Botany, tell me best topic related to botany

tell me best topic related to botany

Guards for machines and equipment, Guards for Machines and Equipment ...

Guards for Machines and Equipment Various machines and equipment used for manufacturing require guards for protecting the operator from any injury. These machines include: Wo

Risk management option assessment, Risk management option assessment : ...

Risk management option assessment : Identification of available management options Selection of preferred management option , including consideration of an appropriate saf

Define about the pseudosquint, Define about the Pseudosquint (Pseudo-false...

Define about the Pseudosquint (Pseudo-false) Pseudosquint is the condition when despite the visual axis being parallel, there , appears to be a squint. Pseudosquint can be conv

Metabolism, Metabolism Metabolism as you know is a process by which li...

Metabolism Metabolism as you know is a process by which living organisms acquire and use energy. A large number of biochemical reactions take place in the living organisms dur

Explain susceptible organisms of tubeculosis, Susceptible Organisms Wh...

Susceptible Organisms When infection proves to be caused by a fully susceptible strain of TB, the initial phase of treatment should include isoniazid, rifampin and pyrazinamid

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd