Blood Composition and Functions

Blood is a vital fluid that performs essential functions such as transporting oxygen, fighting diseases, and regulating body temperature. It consists of plasma and formed elements like red and white blood cells. Blood absorbs oxygen in the lungs and removes carbon dioxide. It plays a crucial role in digestion and hormone transport. Blood also helps in heat distribution and maintaining homeostasis. When vessels are damaged, blood clots to prevent loss. It transports waste to the kidneys and liver for detoxification. Red blood cells primarily transport oxygen, while white blood cells fight infections.

What percentage of blood is made up of plasma?

• 75%

• 45%

• 55%

• 65%

How does blood remove carbon dioxide from the body?

• By converting it into oxygen

• By storing it in red blood cells

• By transporting it to the liver

• By moving it to the lungs for exhalation

Which system's hormones are transported by blood to target organs?

• Endocrine system

• Digestive system

• Respiratory system

• Nervous system

How does blood help in maintaining body temperature?

• By increasing blood pressure

• By expanding and contracting blood vessels

• By reducing blood flow to the skin

• By absorbing heat from the environment

What role do platelets play when a blood vessel is damaged?

• They remove waste substances

• They transport oxygen

• They form a plug to stop blood loss

• They dissolve the clot

Where does blood transport waste substances for filtration?

• To the heart and lungs

• To the kidneys and liver

• To the brain and spinal cord

• To the stomach and intestines

What is the primary function of red blood cells?

• To form blood clots

• To transport oxygen

• To regulate body temperature

• To fight infections

Which type of white blood cell is the most abundant?

• Neutrophils

• Monocytes

• Lymphocytes

• Basophils

What percentage of circulating blood do white blood cells account for?

• 10%

• 1%

• 20%

• 30%

Which of the following is NOT a type of white blood cell?

• Neutrophils

• Erythrocytes

• Eosinophils

• Basophils