Phase 1 (initial repolarization), fast sodium channels close.

TLS Online TPP Program

#Id: 2572

#Unit 7. System Physiology – Animal

Transcellular Pathway

Water and solutes can be transported through the cell membranes by passive diffusion or active transport.

Water and solutes can be transported through the cell membranes by passive diffusion or active transport.

TLS Online TPP Program

#Id: 2573

#Unit 7. System Physiology – Animal

Paracellular Pathway

Water and solutes can be transported between the cells by moving across the tight junctions and intercellular spaces.

TLS Online TPP Program

#Id: 2574

#Unit 7. System Physiology – Animal

Water is transported through the cells and between the tubular cells by osmosis

TLS Online TPP Program

#Id: 2575

#Unit 7. System Physiology – Animal

Transport of water and solutes from the interstitial fluid into the peritubular capillaries occurs by ultrafiltration.

TLS Online TPP Program

#Id: 2576

#Unit 7. System Physiology – Animal

Glucose reabsorption is a two-step process: 

Na+-glucose cotransport across the luminal membrane 

Facilitated glucose transport across the peritubular membrane

TLS Online TPP Program

#Id: 2577

#Unit 7. System Physiology – Animal

Proximal tubular reabsorption

Reabsorbs 67% of the filtered Na+

Reabsorbs 67% of the filtered water

Reabsorbs 100% of the filtered glucose & amino acids 

Reabsorbs 85% of the filtered HCO3−

Reabsorbs most of the filtered phosphate, lactate, and citrate