2007-10-13 21:56:23 · 4 answers · asked by neil r 1 in Science & Mathematics ➔ Medicine
The heart of the baby is not yet fully developed and its pumping actions are not so forceful where some of the heartbeats are still ineffective.
The infant's body is also growing faster and there is an increased metabolic requirements on such period. Also the heart itself like other body parts,needs oxygen in order to grow and develop properly. To meet the needs and demands, the small and not fully developed heart needs more pumping actions to supply the needs of the entire body system. The faster rhythm of the heartbeat could also be partly related to the baby's fast breathing.
As growth goes with development of the systems especially the heart (which strength increases as it grows and develop), the heart beats slow down.
2007-10-14 00:37:20 · answer #1 · answered by ♥ lani s 7 · 0⤊ 0⤋
The heart of an infant is not fully developed. Each beat or
contraction pumps less blood relative to the infant's body size than the adult heart. To make up the difference in relative
stroke volume, the infant heart beats more times per minute.
I agree that an infant's metabolism is also increased.
Usually with a thoughtful question like this the answer
is multi-factorial.
2007-10-13 23:34:06 · answer #2 · answered by Spreedog 7 · 3⤊ 0⤋
Baby is living, and growing. More energy is needed for growth at accelerated metabolism and less quantity of blood and oxygen are available , necessitating rapid action of heart lungs and other organs
Adult is living and stagnating/ageing. Less is needed and more in quantity is available.
2007-10-13 22:08:24 · answer #3 · answered by J.SWAMY I ఇ జ స్వామి 7 · 2⤊ 0⤋
Because they are smaller - the bigger they get, the lower their heartrate gets.
Have you ever noticed how fast a puppies heartbeat is? or any other small creature? it's the same thing.
2007-10-13 22:04:35 · answer #4 · answered by Mommy of One 4 · 0⤊ 0⤋