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.
Your heart rate is the number of times per minute that the heart beats. Heart rate rises significantly in response to adrenaline if a person is frightened or surprised. Taking a person's pulse is a direct measure of heart rate. A normal adult resting heart beat is between 60-100 heartbeats per minute. Some experienced athletes may see their resting heartrate fall below 60 beats per minute. Tachycardia refers to the heart beating too fast at rest - over 100 beats per minute. Bradycardia refers to the heart beating too slow - usually below 60 beats per minute. According to the American Heart Association, heart rate during exercise is around 220 minus the person's age.