Oscillometric blood pressure monitors most accurately measure which component of the arterial pressure?

Which statement most accurately describes this canine ECG? It is lead II and recorded at 25 mm/sec.  

The treatment of choice for runs of several ventricular premature contractions together is which one of the following? Assume appropriate doses are used.

Decompressing the stomach on a GDV patient prior to surgery is not a concern to the anesthetist.

The heart rate displayed by an ECG monitor (based on counting R waves) is highly accurate and can be relied upon.

An anticholinergics, such as atropine, are sometimes used as a premedication. It might be partiuclarly useful before an ophthalmic surgery because of which one of these effects?

The correct oxygen flow rate (based on my recommendations) for a 2 kg patient on a nonrebreathing semiopen circuit such as a Mapleson D circuit would be which one of the following?

When ausculting the heart on a young healthy dog you notice that the heart rate varies slightly, it increases as the dog inhales and decreases between breaths. There are no noticeable differences in pulse quality and there is a pulse with every heart beat. This is most likely which one of the following?

Which image shows the chromosomal makeup of a daughter cell at the end of meiosis I?

Some herbicides (plant killers) work by interrupting the flow of electrons in Photosystem I.  What would be the immediate effect of applying the herbicide?