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Which of these will increase the heart rate?

The ____ cells are most sensitive to reduced O2 levels.​

Imagine a red blood cell leaving the rightventricle of your heart. To which chamber of the heart will that cell return first?

Which of the following would cause an increase in blood pressure (select all that apply):

Air movement to the mammalian respiratory surfaces can be reduced when smooth muscle in the walls of the ____ contract(s).​

Smooth muscle is present in the walls of

Put these phases of the cardiac cycle in the correct order.1  opening of the semilunar valves2  beginning of atrial systole3  closure of the AV valves4  completion of ventricular filling5  beginning of ventricular systole6  ventricular relaxation

The typical osmolarity of body fluids in most freshwater invertebrates is about ____ mOsm/L.​

BONUS After a meal, ectotherms often situate themselves in a warm and or sunny spot.  This can be critical to the health of the animal.  Why is this process important?

Answer the questions using the accompanying figure. Match the appropriate part of the human respiratory system with its correct label.