Let's start with the proximal tubule right here.

So if we're in the distal convoluted tubule, these kind of villi, these things that stick out this is only in the proximal convoluted tubule, those brush borders.

If you remember, in the proximal convoluted tubule, we talked about maybe glucose and amino acids and sodium being reabsorbed.

So the inside, I'm going to draw it like this because the proximal tubule has these little things that stick out, sometimes referred to as a brush border.

Same thing in the distal convoluted tubule.

So this is our proximal convoluted membrane right here.

In the distal convoluted tubule, it was calcium, other things.

And then just finishing up at the distal convoluted tubule.

See also Collecting duct carcinoma References External links Collecting Duct (Kidney) Urinary System kidney, medulla, collecting duct and ascending tubule Urinary System kidney, H E, collecting duct and ascending tubule

And then the border of the tubule is made up by a bunch of cells.

Flexor digitorum superficialis ( flexor digitorum sublimis ) is an extrinsic flexor muscle of the fingers at the proximal interphalangeal joints.

These are situated at the proximal end of the bone, that is the end that connects with the scapula.

Vygotsky introduced the notion of zone of proximal development, an innovative metaphor capable of describing the potential of human cognitive development.

Vygotsky (1978) referred to this as the Zone of Proximal Development and believed that fostering development within this zone leads to the most rapid development.

So the side of the cells that are facing the lumen, or kind of facing the inside of our tubule, this is called the apical side.

This is true regardless of what part of the nephron we're in, whether the proximal, whether the loop of Henle, or whether we're in the distal part.

However, unlike Piaget, he claimed that timely and sensitive intervention by adults when a child is on the edge of learning a new task (called the zone of proximal development) could help children learn new tasks.