1B The Circulatory System - Haemoglobin / Blood Clotting

Which of the description below is NOT referring to erythrocytes?

• Do not contain a nucleus

• Contain mitochondria

• Contain haemoglobin

• Have a biconcave shape

Which of the descriptions following is referred to leucocytes?

• Have a limited life of about 120 days

• Contain lots of haemoglobin

• Have nucleus and mitochondria

• Have biconcave disc

Erythrocytes contain ................................., which combines with oxygen to form .............................................. in areas of high concentration and releases ................................... in areas of low concentration.

State the function of lymphocytes.

Answer explanation

Secrete antibodies

Name the two different groups of leucocytes.

Answer explanation

granulocytes and agranulocytes

Platelets are cell fragments and involved in ...............................................

Which of the following is the function of plasma?

• Transport oxygen from lungs to respiring tissues

• Involved in immune defense

• Involved in blood clotting

• Contains electrolytes which are important for maintaining fluid balance and blood pH

Name 3 substances transported by plasma.

Answer explanation

nutrients

excretory products / urea

hormones

dissolved proteins

antibodies

heat

Haemoglobin is a globular conjugated protein which has a .................................... structure consisting of 2 ................. chains and 2 ................. chains which each contain a ...................... group which have .................. ions that can bind to oxygen.

Each iron ion can combine with ........... oxygen atoms, so one Hb molecule can combine with .............. oxygen atoms.