cones are specialized reproductive structures of the sporophyte. Each cone consists of several âscalesâ arranged around an axis. Each scale is a sporophyll that will bear the spores of the sporophyte generation. An ovulate cone has many hard, radiating scales, each bearing a pair of ovules. Pollen cones are generally much smaller than ovulate cones; they contain many sporangia, each of which makes numerous haploid spores by meiosis. Male gametophytes (pollen grains) develop from the spores.
Bradycardia was defined as a heart rate less than 60 beats per minute when textbooks asserted that the normal range for heart rates was 60â100 BPM. The normal range has since been revised in textbooks to 50â90 BPM for a human at total rest.
a normal resting heart rate for adults ranges from 60 to 100 beats a minute generally a lower heart rate at rest implies more efficient heart function and better cardiovascular fitnessfor example a well trained athlete might have a normal resting heart rate closer to 40 beats a minuteto measure your heart rate simply check your pulse place your index and third fingers on your neck to the side of your windpipe normal resting heart rate for adults ranges from 60 to 100 beats a minute generally a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness