1.List three different molecules that are filtered OUT of the blood by the glomerulus. What do...

1.List three different molecules that are filtered OUT of the blood by the glomerulus. What do these molecules have in common?

2.What types of molecules are reabsorbed in the proximal convoluted tubule? What is the primary method of reabsorption in the PCT? What ion is involved?

Expert Solution

1. Glomerular filtration is the process by which blood is filtered while passing through the glomerular capillaries by filtration membrane. Filtration membrane is formed by three layers- glomerular capillary membrane, basement membrane and visceral layer of bowman's capsule.

The examples of substances filtered in glomerulus are-

◆ water

◆ urea

◆ sodium

The one thing common between them is that the size of these molecules are smaller than the size of the filtration pores in the glomerular membrane. That's why these passes through the pores. Blood cells don't pass through them because the size is greater than size of the the filtration pores.

2. About 88% of filtrate is reabsorbed in proximal convulated tubule. Substances reabsorbed from PCT are glucose , amino acids, sodium, potassium, calcium , bicarbonate, chlorides , phosphatase,urea and water.

Substances like sodium, calcium, potassium, phosphate,glucose etc are absorbed by active reabsorption. This need ATP.

Substances like urea , chloride and water are passively reabsorbed.

Sydney Mullin answered 1 year ago

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