Plants: haploid generation of a plant produces gametes (sperm and eggs) and is called the gametophyte; the diploid generation produces spores and is called the sporophyte/ diploid zygote.
1 You gain the most benefits and lessen the risks when you exercise in your target heart rate zone. 2  Usually this is when your exercise heart rate (pulse) is 60 to 80 percent of your maximum heart rate. 3  In some cases, your health care provider may decrease your target heart rate zone to begin with 50 percent.
The normal human heart beats at a rate of 60 to 100 times per minute. A heart rate exceeding 200 beats per minute is not uncommon during heavy exercise. Physically fit individuals, especially endurance athletes can have resting heart rates as low as 40 beats per minute.