A. Pacemaker cells located in the atria fire before the pacemaker cells in the ventricles. B. It takes time for hormones to diffuse from the atria to the ventricles to trigger contraction. C.The electrical signal generated in the right atrium is delayed at the AV node before passing to the ventricles. D.The ventricular muscle cells contract more slowly than the atrial muscle cells.
Answer:
Bacillus cereus
Explanation:
Bacillus cereus is a bacteria associated with foodborne infection (which is what happened to the children exposed in the question). These bacteria usually grow on rice that has not been properly cooled or heated.
The poisonings caused by Bacillus cereus result from the ingestion of food contaminated with the microorganism and / or the enterotoxins it produced during its growth. The poisonings associated with this microorganism are usually of short duration and not severe. However, several sporadic outbreaks and cases have been reported.
I believe the statement is true. The Greeks and Romans observed groups of stars in the northern two-thirds of the sky. It is the Greeks who discovered or made the constellation system. Then, the Greek and the Romans named these certain group of stars base from animal and mythological beings.
