Which are electrical "nodes" of the heart? Check

all that apply.

sinoatrial node

aortic node

lymph node

heart node

atrioventricular node

Which body system rapidly communicates information using electrical signals? A. Endocrine B. integumentary C. Nervous D. Respiratory

Which of the following is an example of how taxon classification might change?

What rule is used to join the free nucleotides to the exposed bases of the dna

Warm air rises at the equator and cold air sinks near the?

The phenomenon that results from the rapid changes in tissue and fluid pressure that occur with the passage of a projectile, resulting in serious injury to internal organs distant to the actual path of the bullet, is known as what?

How did Francesco Redi disprove the idea of spontaneous generation? He showed that flies were not produced by meat. He showed that microorganisms are present in air. He showed that microorganisms cause disease. He showed that flies spread disease.

Of the millions of sperm who start the long journey to the egg, how many sperm are actually allowed to enter the egg?

A mineral leaves a gray trail when scraped against an unglazed porcelain plate. Which property of a mineral is being measured? A. luster B. streak C. color D. hardness

Which two systems in the human body are devoted exclusively to the regulation of organ function?

A 40-year-old man reports to his health care provider complaining of "heartburn" that occurs after eating and also wakens him at night.