Blood Composition and Functions

Questions and Answers

Water

Digestion

Defense against pathogens Signup and view all the answers

Presence or absence of A and B antigens Signup and view all the answers

A bleeding disorder due to clotting factor deficiency Signup and view all the answers

Blood clotting Signup and view all the answers

A decreased RBC count or hemoglobin level Signup and view all the answers

7% Signup and view all the answers

Study Notes

Blood is a liquid tissue that makes up approximately 7% of an adult's body weight
Composition:
- Plasma (55%): liquid portion of blood
  - 92% water
  - 7% proteins (albumin, globulins, fibrinogen)
  - 1% nutrients, hormones, gases, waste products
- Formed Elements (45%): suspended cells and platelets
  - Red Blood Cells (RBCs or erythrocytes)
  - White Blood Cells (WBCs or leukocytes)
  - Platelets (thrombocytes)

Transportation:
- Oxygen from lungs to body tissues
- Carbon dioxide from body tissues to lungs
- Nutrients from digestive system to body tissues
- Hormones from endocrine glands to target cells
Regulation:
- pH balance
- Body temperature
- Blood pressure
Protection:
- Defense against pathogens (WBCs)
- Blood clotting (platelets and plasma proteins)
Waste removal:
- Removal of waste products from body tissues

ABO Blood Group System:
- A (presence of A antigen on RBCs)
- B (presence of B antigen on RBCs)
- AB (presence of both A and B antigens on RBCs)
- O (absence of A and B antigens on RBCs)
Rh Blood Type System:
- Rh positive (presence of Rh antigen on RBCs)
- Rh negative (absence of Rh antigen on RBCs)

Blood makes up approximately 7% of an adult's body weight
Plasma consists of:
- 92% water
- 7% proteins (albumin, globulins, fibrinogen)
- 1% nutrients, hormones, gases, waste products
Formed elements consist of:
- Red Blood Cells (RBCs or erythrocytes)
- White Blood Cells (WBCs or leukocytes)
- Platelets (thrombocytes)

ABO Blood Group System:
- A: presence of A antigen on RBCs
- B: presence of B antigen on RBCs
- AB: presence of both A and B antigens on RBCs
- O: absence of A and B antigens on RBCs
Rh Blood Type System:
- Rh positive: presence of Rh antigen on RBCs
- Rh negative: absence of Rh antigen on RBCs