Blood

Question 1

what do circulatory systems require

Answer 1

• pump
• transport medium
• vessels
• exchange surfaces

Question 2

structure of blood

Answer 2

• red blood cells (erythrocytes)
• white blood cells (leucocytes)
• platelets (thrombocytes)
• plasma (transport media)

Question 3

red blood cells

Answer 3

• small, flexible, numerous (45% of blood)
• oval, biconcave discs
• haemoglobin rich - carry O2 & CO2
• circulate around body every 60 seconds
• develop in Red Bone Marrow
• last 100 -120 days
• recycled in spleen, delivered to kidneys for disposal

Question 4

plasma

Answer 4

• 55% of total blood - sticky yellow fluid

blood plasma carries:

• water, nutrients, hormones
• heat, clotting agents,
• blood gases (O2 & CO2)
• electrolytes (minerals Na, Ca, Mg etc)

Question 5

types of white blood cells

Answer 5

• neutrophil
• basophil
• eosinophils
• monocytes
• lymphocytes