Blood

Question 1

What are some functions of blood?

Answer 1

Transport

• Transports nutrients, oxygen and hormones to the tissues
• Removes waste such as carbon dioxide and urea

Regulation

• Helps to keep the body’s pH within its homeostatic range
• Helps in regulating the bodies temperature

Protection

• Prevents blood loss if blood vessels are damaged
• Prevents the body from toxins and pathogens

Question 2

What are the features of Blood

Answer 2

Temprature = 38 C
pH = 7.35/7.45
Salinity = 0.9%
Total body weight = 8%
Volume:
- Men 5-6L
- Women 4-5L

Question 3

Describe Blood Plasma

Answer 3

• A clear, pale, yellow liquid that comprises 46-63% of the whole blood
• Plasma is 92% water
• it is dissolved organic and inorganic solutes (wastes)
• Also consists of plasma proteins (7%)
  Forms Fe (iron)

Question 4

Describe Erythrocytes

Answer 4

• Also known as red blood cells
• Transport respiratory gas
• Biconcave disks for larger surface area
• short life span (!20 days)
• Contains hemoglobin that combines 02
• Removed by spleen and liver
• Made in bone marrow

Question 5

Describe leucocytes

Answer 5

• Also known as white blood cells
• Protect the body against invasive organisms and tumour cells
• Different types attack different cells/organisms
• Move via amoebid motion

Question 6

Describe Thrombytes

Answer 6

• Also known as platelets

- used in clotting