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What key event occurs at the respiratory zone in the lungs?  Put answer in the space provided.

If one was looking at the record of an EKG and, below it, a record of the heart sounds, then the second heart sound would occur after the [answer1] complex/wave, while the first heart sound would occur after the [answer2] complex/wave.

According to your laboratory handout, the time between the peak of the R wave and the onset of the _______ (lub) is the R-Lub interval.

The ______ spread throughout the ventricles to conduct action potentials directly to the ventricular myocardial cells.

The likely hormonal mechanism for the dramatic change in urine volume that occurred in the 500 ml water group during the first hour of the experiment was due to the inhibition of _______.  Spell out answer.

Match the following:         

The cells that play a role in the process of blood clotting are the _________.

A decrease in the R-R interval (for whatever reason) would indicate what change, if any, in heart rate?

The second heart sound occurs during which specific phase of the cardiac cycle? _________  Remember that there are at least 5 specific phases in the cardiac cycle.

The __________ are responsible for producing the fluid that lubricates the urethra prior to ejaculation.