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.
Normal Heart Rate: The ideal range for adult heart rate is 60-100 BPM as long as it is a regular rhythm, that is all beats are evenly spaced.If you are feeling pain, palpitations, shortness of breath or discomfort you should consult a doctor.es: Normal heart rate range is defined as 60-100 bpm. It should be noted however that some people have rates outside this range that are still considered normal.