Tight junctions between adjacent Sertoli cells near the basal lamina form a blood–testis barrier

TLS Online TPP Program

#Id: 7978

#Unit 10. Ecological Principles

Thermal stratification

TLS Online TPP Program

#Id: 7979

#Unit 10. Ecological Principles

Water achieves its highest density—that is, its molecules are the most packed together—at 4°C.

TLS Online TPP Program

#Id: 7980

#Unit 10. Ecological Principles

Organisms that are denser than their surrounding water, a variety of adaptations can either reduce an organism’s density or retard its rate of sinking.

TLS Online TPP Program

#Id: 7981

#Unit 10. Ecological Principles

Many fish species have a gas-filled swim bladder that can adjust in size to make the density of the fish’s body equal to that of the surrounding water.

TLS Online TPP Program

#Id: 7982

#Unit 10. Ecological Principles

Adaptation to water viscosity

Some small aquatic organisms exploit the high viscosity of water by evolving large appendages

Streamlined shapes that reduce the drag caused by the high viscosity of water

TLS Online TPP Program

#Id: 7983

#Unit 10. Ecological Principles

Increased amounts of the amino acid proline or sugars such as glucose and fructose increase solute concentration, drawing water into the cells.