ions and purposes

Question 1

Cl ions (3)

Answer 1

• regulate haemoglobins affinity for oxygen
• form acids in the stomach
• regulate water balance (chloride)

Question 2

Na ions (3)

Answer 2

• regulates osmotic pressure
• muscle contraction
• co- transport of glucose in the intestines

Question 3

Nitrate ions (2)

Answer 3

• important in nitrogen cycle
• essential part of nucleic acids

Question 4

hydrogen ions (2)

Answer 4

• determine the ph of solutions
• important in photosynthesis and respiration