Balbharati Class 8 General Science Solutions Human Body and Organ System
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of Balbharati Class 8 General Science Book Chapter 11, Human Body and Organ System. Here students can easily find step by step solutions of all the questions in Human Body and Organ System. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 11 solutions. Here all the Question Answer are based on Balbharati latest syllabus. Here all the question and answer are based on Maharashtra State Board latest syllabus.
Human Body and Organ System Exercise question Solutions :
Question no – (1)
(1) → (d) 72
(2) → (e) 50-60 lakh/mm³
(3) → (f) 5000 – 6000 per mm³
(4) → (a) 350ml
(5) → (c) 37°C
(6) → (b) 7.4
Question no – (2)
(1) Respiratory System :
Organs : Nose, Pharynx, Windpipe, Lungs and Diaphragm.
Function : The function of the respiratory system is to provide the body with oxygen and to get rid of carbon dioxide.
(2) Circulatory System :
Organs : Heart, Arteries, Veins and Capillaries.
Function : The main function of the circulatory system is to transport hormones, water, nutrients, oxygen and waste thorough out the body.
Question no – (3)
(a) Human blood is red coloured.
Reason : Human blood is red colored because of the presence of hemoglobin in it.
(b) Upward and downward movement of diaphragm occurs consecutively.
Reason : Upward and downward movement of diaphragm occurs consecutively so that the pressure difference keeps a continuous flow of air in and out.
(c) Blood donation is considered to be superior of all donations.
Reason : Blood donation is considered to be superior of all donations because the blood donation from a healthy person can be used to save the life of a needful person.
(d) Person with ‘O’ blood group is considered as ‘universal donor’.
Reason : Person with ‘O’ blood group is considered as universal donor because he can donate his blood to people of any other blood groups.
(e) Food must have limited amount of salts.
Reason : Foods must have limited amount of salt because too much salt in food can lead to hypertension or High blood pressure which may be fatal.
Question no – (5)
(a) Circulatory system is functionally related to respiratory system, digestive system and excretory system as circulation of blood itself transports oxygen, nutrients and waste in the body and thus has a little role in functioning of other organ systems.
(b) Human blood is mainly composed of two components that are plasma and blood cells, the plasma is then composed of alkaline fluid, albumins, globulins, fibrinogen, prothrombin and inorganic ions and there are basically three types of blood cells that helps in forming blood they are RBCs, WBCs and Platelets.
The function of blood are as follows :
- Transporting oxygen to the whole body.
- Transporting nutrients to the whole body.
- Transporting waste materials to kidney for excretion.
- Maintaining body temperature.
- Producing antibodies to protect against bacteria and viruses.
(c) Blood donation is important because if a person meets with an accident or anemia or thalassemia or cancer blood transfusion is necessary to keep that person alive. It is important because the donor himself may need blood in the future. Blood donation is a noble cause as it saves lives.
Question no – (6)
(a) The differences between arteries and veins are as follows :
- Arteries :
Arteries carry blood away from Heart.
Their walls are thick and don’t have valves.
Except one carrying blood towards lung all other carry oxygenated blood.
- Veins :
Veins carry blood to the heart
Their walls are thin and have valves.
Except one carrying blood from lungs all other carry deoxygenated blood.
(b) The difference between external and internal respiration are as follows: –
- External respiration :
Both inhalation and exhalation with the help of lungs are known as internal respiration.
Oxygen gets from outside and into blood and carbon dioxide gets from various body parts to lungs.
- Internal respiration :
The exchange of gases bet – ween cells and tissue fluid is known as internal respiration.
Oxygen moves from blood into tissue fluid and carbon dioxide gets from tissue fluids into blood
Question no – (7)
In order for a person to donate blood he must have a normal pulse rate, normal body temperature, a healthy weight, normal blood pressure, must not have any diseases that may be transferred by transfusion and must have proper hemoglobin level.
Question no – (8)
(a) RBCs of the blood contain Hemoglobin, an iron compound.
(b) Diaphragm is present between thoracic and abdominal cavity.
(c) Cardiac muscles are Involuntary.
(d) pH of oxygenated blood is Alkaline.
(e) Production of RBCs occurs in Red bone marrow.
Question no – (9)
(a) Here the odd one is – K
Because, apart from K all other are blood groups.
(b) Here the odd one is – Blood transfusion
Because, apart from blood transfusion all other are components of blood.
(c) Here the odd one is – Capillaries.
Because, apart from capillaries all other helps in respiration.
(d) Here the odd one is – Neutrophils
Because, apart from neutrophils all other are components of plasma
Question no – (10)
The disease here is Cyanosis. Blue nails, shortness of breath and weakness are symptom of cyanosis. This happens when proper amount of oxygen doesn’t circulate in your body.
Question no – (11)
In order to keep his pressure under control he should do regular exercises, quit smoking, limit the level of salt in his diet, loose some weight and take a little bit of stress out of his life.
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