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How do endotherms and ectotherms derive most of their body heat?

You can be outside on an day where the air temperature is 85oF for hours without getting cold. However, you will get cold in 85oF water before too long unless you are very active. This difference is due to

Fish in a marine environment must maintain a relatively constant ion concentration in their tissues and blood. How do the chloride cells in the gills aid fish in the removal of excess ions?

Which of the following statements about the control of blood volume and blood pressure is NOT true?

O2 is transported from air in the lungs into the blood through the process of ____.​

The two organ systems that work together to regulate most aspects of the body’s water balance are

BONUS If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,

Which of the following statements about freshwater fish is NOT true?

How do endotherms and ectotherms derive most of their body heat?

The two organ systems that work together to regulate most aspects of the body’s water balance are