Inorganic Ions Flashcards

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1
Q

Where do they occur?

A

Occur in solution in the cytoplasm and body fluids of organisms, some in high concentrations and others in very low concentrations

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2
Q

Role of Hydrogen Ions (pH)

A

Hydrogen ions are also important for maintaining the low pH of the gastric juices within the stomach which is important for digestion

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3
Q

Role of Iron Ions (Haemoglobin)

A

Iron ions are essential as they can bind oxygen

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4
Q

Role of Sodium Ions (Co-Transport of glucose & amino acids)

A

First, Na+ is actively transported out of the epithelial cells that line the villi

The Na+ concentration inside the epithelial cells is now lower than the Na+ concentration in the lumen of the small intestine

Na+ now re-enters the cells (moving down the concentration gradient) through co-transport proteins on the surface membrane of the epithelial cells, allowing glucose and amino acids to enter at the same time

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5
Q

Role of Phosphate Ions (components of DNA and of ATP)

A

Attaches to other molecules to form phosphate groups

The phosphate groups allow individual nucleotides to join up (to form polynucleotides)

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