An ectopic focus is the place where
a. an abnormally excitable area of the heart initiates a premature action potential
b. all of the electrical impulses of the heart terminate normally
c. an ECG lead is attached on the outside of the chest
d. a heart valve is attached
e. the chordae tendineae attach to a valve
A
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A laboratory rat has an electrode implanted in its brain. By pressing a metal bar in its cage, the animal can activate the electrode. You are analyzing the data from the most recent experiment day and find that the rat pressed the bar over and over again. The rat did not even eat during the experimental period because it was too busy pressing the bar. In which location is the electrode likely to be implanted?
A. Occipital lobe B. Frontal lobe C. Hypothalamus D. Mesolimbic system E. All of the choices are possible locations of the electrode.
The vertical osmotic gradient in the kidney
a. is established and maintained by the countercurrent system b. makes it possible to put out urine of variable concentration depending on the needs of the body by varying the degree of water permeability of the distal portions of the nephron c. is found in the renal cortex d. has characteristics a and b e. has characteristics a and c
Smooth muscle _____________.
a. has long, cylindrical cells b. has striations c. is under involuntary control d. contains intercalated discs
Which are applicable to the stratum corneum?a: Most superficial stratumb: Consists of about 3-5 cell layersc: Cells are deadd: Interlocking keratinized cellse: Cells are anucleate
A. a, c, e B. a, c, d C. a, b, d D. a, c, d, e E. a, b, c, d, e