Hey frnd
Muscular to pump blood over long distance;
- Myogenic cardiac muscles which contract and relax rhythmically without fatigue; hence heart continues pumping;
- Cardiac muscle fibres interconnected to form a network of fibre to ensure rapid and uniform spread of excitation throughout the walls of the heart;
- Heart divided into 4 chambers which are hollow to accommodate more blood;
- Ventricles have thicker walls than auricles to generate higher pressure to drive blood over long
distance into more elaborate circulation/to the lungs and to all body tissues
Answer:
One possible explanation for why <u><em>maternal age</em></u> is a primary risk factor for autosomal trisomy is that oocytes remain in meiosis I until ovulation, which could take<em> place many years after birth, making them more susceptible to damage.</em>
Explanation:
Increasing age becomes a risk for abnormal children like children with autosomal trisomy because as the age of the female increases, the chances of abnormal division of chromosomes in the egg of the female also increases. After the age of 30, the chance of having a baby with autosomal trisomy increases exponentially. The risk primarily increase because of the abnormalities in meiosis in the women.
Answer:
Horsetails vary in appearance, but they all lack leaves and have no close relatives. The most similar group of plants are the ferns. They use both their branches and their stems for photosynthesis, as opposed to having foliage. The stalks of the horsetails are almost hollow in the center.
Explanation:
Answer:
An educated guess before doing an experiment
