Question

• the differences between water soluble and lipid soluble hormones – if they can pass through the plasma membrane, where they bind to receptors and how each type triggers a cellular response
• the difference between an animal that is a regulator versus a conformer
• the difference between animals that are endothermic versus ectothermic and examples of each

Answer 1

Ans(1): Water-soluble hormones bind to receptors on the surface of the target cell, whille, lipid-soluble hormones bind to receptors inside the target cell.

Ans(2): Regulators are those organisms who can maintain a constant internal environment regardless of the external environmental changes. For example, warm blooded animals like mammals, birds etc. which can maintain their body temperature.

Conformers are those organisms who cannot maintain their internal environment, they change their internal environment with change in external environment accordingly. For example, cold blooded animals like lizards, snakes, insects etc.

Ans(3): Endothermic organisms (animals) are those who use internally generated heat to maintain their body temperature. Their body temperature tends to stay steady regardless of change in temperature of environment. For example, warm blooded animals like mammals, birds etc. which can maintain their body temperature.

Ectothermic organisms (animals) depend mainly on external heat sources, they cannot maintain a steady body temperature and their body temperature changes with the change in the temperature of the environment. For example, cold blooded animals like lizards, snakes, insects etc.