What Are the Types and Functions of Body Fluids and Circulation
Human circulatory system, or the cardiovascular system (along with body fluid), is of vital importance. Together, they serve as a medium of transportation for oxygen, nutrients, hormones and other important substances.
In this article, we will cover the different types of body fluids and circulation in brief. As a result, you will become familiar with the function and importance of body fluids in our system.
Continue reading below to find more about body fluids and circulation Class 11!
Body fluids are several different types of liquids that are present inside the body. Generally, such fluids are either excreted out of the system or circulate within the body.
In a broad sense, body fluids are classified as two intracellular fluid and extracellular fluid. In general, there are 7 body fluids, namely – blood, gastric juice, cerebrospinal fluid, saliva, semen, mucus and urine.
On that note, let’s proceed to find out about the essential body fluids.
Types of Body Fluids
Undoubtedly blood and lymph are the most crucial body fluids. Human blood is a connective tissue fluid which comprises of white blood cells, red blood cells, plasma and platelets.
Blood is red because of the presence of haemoglobin. Blood flows in two directions – from the heart to tissue and from tissues to heart.
On the other hand, lymph is a transparent fluid which circulates inside lymphatic vessels and is also known as the tissue fluid and interstitial fluid.
This image shows components of blood and lymph.
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Test Your Knowledge:
Which of these is also known as RBC?
a) Leucocytes
b) Erythrocytes
c) Thrombocytes
Functions of Body Fluids
These are among a few functions of body fluids.
Transportation of vital nutrients and oxygen to all essential organs.
Removal of toxic waste.
Regulation of body temperature.
Regulation of metabolism.
DIY: Find out the largest lymphatic organ in the human body.
What is Circulation?
It is the flow of blood through blood vessels, which transport respiratory gases and nutrients. This movement is also responsible for removing waste from different body parts.
Other than these, the circulatory system is also responsible for transmitting hormones from endocrine glands to different organs. They also facilitate the destruction of pathogens and help to remove the body’s metabolic waste.
Notably, there are two types of circulatory systems –
Open circulatory system
Closed circulatory system
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Mechanism of Circulation
In human beings, the heart is responsible for transporting blood all over the body. It comprises two upper chambers – atria or auricles and two lower chambers known as ventricles.
The arteries convey the oxygenated blood from the heart and other parts of the body. On the other hand, the veins send the deoxygenated blood to the heart from different organs.
However, there is an exception to it. To elaborate, the pulmonary vein supplies oxygen-rich blood to the heart, whereas the pulmonary artery takes deoxygenated blood away from it.
Maintenance of blood pressure and increased blood flow to tissues are among the most prominent advantages of double circulation. Also, it creates enough pressure to pump blood to the entirety of the system.
Find more about the functioning of the heart by referring to quality body fluids and circulation NCERT notes and strengthen your knowledge further.
Disorders of the Circulatory System
These are some common disorders associated with this system –
Hypertension or high blood pressure.
Cardiac failure.
Angina.
Coronary Artery Disorder.
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Body Fluids and Circulation - At A Glance
There are two types of circulatory systems prevalent in living beings, that is, the closed circulatory system and the open circulatory system.
The circulatory system consists of the heart, which is a muscular pump, blood vessels, and circulating fluid, that is, blood and lymph.
Blood is an essential body fluid that helps in the collection of wastes, transportation of gases, maintaining an optimum body temperature, and protecting the individual from diseases.
The wave of contraction in the heart travels from the S.A. node to the A.V. node followed by the bundle of HIS and finally to Purkinje fibres.
The main blood vessels that make a component of the circulatory system are arteries, veins, and capillaries.
The superior vena cava and the inferior vena cava collect blood from all parts of the body and bring it to the heart whereas pulmonary veins take the blood from the heart and give it to the aorta for distribution in all parts of the body.
The process by which blood is produced is known as hemopoiesis that occurs in the bone marrow of a human body.
The main components that make up the blood are plasma and cell components (RBCs, WBCs, and blood platelets).
A healthy individual has a normal blood pressure of 120/75 mm of mercury, though it can decrease or increase by 5 mm of mercury depending upon the person. The blood pressure of a human being is measured by a device known as a sphygmomanometer.
The colourless fluid that moves out of the capillary wall is known as lymph.
The ability by which the body protects itself from harmful substances is known as immunity and any disorders in this system lead to disorders like AIDS (caused by HIV virus) and SCID (an immunodeficiency disorder).
FAQs on Body Fluids and Circulation in Humans
1. What are body fluids in biology?
Body fluids are the liquid components of the body that transport substances, maintain balance, and support vital functions. In human biology, body fluids are mainly classified into:
- Intracellular fluid (ICF) – fluid inside cells
- Extracellular fluid (ECF) – fluid outside cells, including blood plasma and tissue fluid
2. What are the main types of body fluids?
The main types of body fluids are intracellular fluid and extracellular fluid. They are divided as follows:
- Intracellular fluid (ICF) – makes up about two-thirds of total body fluid and is found inside cells
- Extracellular fluid (ECF) – makes up about one-third and includes:
- Blood plasma
- Tissue (interstitial) fluid
- Lymph
3. What is blood and what are its components?
Blood is a specialized connective tissue that circulates through blood vessels to transport oxygen, nutrients, hormones, and wastes. It consists of:
- Plasma – the liquid matrix containing water, proteins, salts, and nutrients
- Red blood cells (RBCs) – carry oxygen using hemoglobin
- White blood cells (WBCs) – provide immune defense
- Platelets – help in blood clotting
4. What is the function of plasma in blood?
Plasma is the liquid portion of blood that transports cells and dissolved substances throughout the body. Its key functions include:
- Carrying nutrients, hormones, and metabolic wastes
- Maintaining blood pressure and volume
- Transporting plasma proteins such as albumin, globulins, and fibrinogen
- Helping in blood clotting and immune responses
5. What is tissue fluid and how is it formed?
Tissue fluid is the interstitial fluid that surrounds body cells and is formed from blood plasma. It is formed by:
- Filtration of plasma from capillaries due to blood pressure
- Movement of water and small solutes into the spaces between cells
6. What is lymph and what is its function?
Lymph is a clear body fluid formed from tissue fluid that enters the lymphatic vessels. Its main functions are:
- Returning excess tissue fluid to the bloodstream
- Transporting absorbed fats from the small intestine
- Providing immune defense through lymphocytes
7. How does circulation of body fluids occur in humans?
Circulation of body fluids in humans occurs through the coordinated action of the circulatory system and lymphatic system. The process includes:
- The heart pumping blood through arteries, capillaries, and veins
- Exchange of substances between blood and tissue fluid at capillaries
- Collection of excess fluid by lymphatic vessels as lymph
- Return of lymph to the bloodstream
8. What is the difference between blood and lymph?
The main difference between blood and lymph is that blood contains red blood cells and circulates in closed vessels, while lymph is a clear fluid without red blood cells that flows in lymphatic vessels. Key differences include:
- Blood: Contains RBCs, WBCs, platelets, and plasma; pumped by the heart
- Lymph: Contains mainly lymphocytes; not directly pumped by the heart
- Blood transports oxygen and nutrients; lymph mainly returns excess tissue fluid and supports immunity
9. Why is circulation important in the human body?
Circulation is important because it ensures the transport of oxygen, nutrients, hormones, and waste products throughout the body. Its major roles include:
- Supplying oxygen to cells for cellular respiration
- Removing carbon dioxide and metabolic wastes
- Maintaining body temperature and pH balance
- Supporting immune responses
10. How do body fluids help maintain homeostasis?
Body fluids maintain homeostasis by regulating fluid balance, temperature, pH, and electrolyte concentration. They achieve this by:
- Distributing heat evenly through blood circulation
- Maintaining osmotic balance between intracellular and extracellular fluids
- Transporting hormones that regulate body functions
- Removing toxins and metabolic wastes via blood and lymph
