Answer:
1. spontaneously
2. resting potential
3. action potentials
4. pacemaker potentials
5. K+
6. Na+
7. into
8. Ca+
Explanation:
Pacemaker cells (also known as sinoatrial node cells) are cells that generate rhythmic impulses and set the pace for blood pumping in the heart. These cells have the ability to rhythmically depolarize and initiate action potentials. In pacemaker cells, Ca2+ and Na+ levels are higher in the extracellular environment, while K+ concentration is higher intracellularly. The pacemaker action potentials have three phases: 1-depolarization, where membrane potential reaches -40 mV and voltage-gated Ca2+ channels open, 2-repolarization, where voltage-gated Ca2+ channels close and voltage-gated K+ channels open, and finally 3-gradual depolarization, which is caused by the slow influx of Na+ ions.
Answer: 2, They measure how rich in nutrients a food is.
Explanation: Just by process of emimination, I know that "heat a food can supply" has nothing to do with calories.
Answer:
under drug use are sentences 1 and 3. Under drug misuse are sentences 6 and 2. And under drug abuse are sentences 4 and 5.
Explanation: drug abuse is classified as using illegal drugs or doing legal drugs when one is just underaged. Drug use is when the person with the drugs is using them correctly and safely. Drug misuse is when a person has prescription medicines and take too high of dosages or use them for the wrong purposes.
Answer:
In comparison to other sports, tennis is often deemed a sport that is not dependent on muscular strength/endurance. Nonetheless, an athlete's performance in tennis could be improved by increasing both muscular strength and endurance. Tennis relies on the players ability to get from one side of the court to another, ready to hit the ball with strength and intent to their opponent's side of the court. With low endurance, tennis is near to impossible to play as you have to run back and forth nearly the whole time.
Explanation:
CFC molecules are broken down in the
stratosphere by ultraviolet light to give highly reactive chlorine atoms. Then chlorine atoms react with ozone molecules. Last chlorine atoms are regenerated by this chain reaction so can react with
more ozone molecules.
