Composition of Human Blood

Cellular component


       i)PLATLES/ THROMBOCYTES

•  No nucleus
•  important in process of blood clotting

        ii)RED BLOOD CELL/ ERYTHROCYTES

• Biconcave disc shaped
• Increase TSA/V
• No nucleus to give space for great quantities of haemoglobin, Hb
• Manufactured in bone marrow
• Destroyed in spleen and liver
• Lifespan 120 days @ 4 months

        iii)WHITE BLOOD CELL/ LEUCOCYTES

 

DIVIDE BY 2 GROUPS

 - granulocytes and agranulocytes

GRANULOCYTES ( B. E. N)

• HAVE GRANUL & LOBED NUCLEI

Basophils

-secrete heparin to prevent blood clot

Eosinophils

-control allergic response

Neutrophils

-most in WBC

AGRANULOCYTES 

• NO LOBES & GRANUL

Lmphocytes

-kidney shaped nucleus

Lmphocytes

-produce antibody

1.2 Circulatory system

 1. Circulatory system involves

• deliver nutrients and oxygen to the cells
• carry carbon dioxide and other waste product away form the cells
• for body defense

2. 3 component of circulatory system

• MEDIUM: Blood
• BLOOD VESSELS: Arteries, veins, cappilaries
• PUMPING ORGAN: Heart

## BLOOD IS A CONNECTIVE TISSUE

Chapter 1: Transport (Unicell and multicell)

1.1 Problem faced by multicellular in obtaining their cellular requirements and removing their waste products

Unicellular organisms:

• Eg: Amoeba sp and Paramecium sp
• Have large total surface area (TSA/V)
• Obtain oxygen and nutrients
• Carbon dioxide eliminated by diffusion (simple diffusion)
• Doesnt need internal transport system

Multicellular organisms:

• Eg: man, cow, rat, etc
• Have small TSA/V