Stomach with rugae
Rugae are sets of ridges formed by
folding of the wall of an organ. The stomach rugae exist in the mucosal and
submucosal layers of the stomach. They function through the action of
mechanoreceptors which provide contraction and allow the stomach to expand when
a bolus enters it. By this action, there is increase in the surface area of the
stomach for nutrient absorption during digestion.
To understand the global systems and the changes they undergo in a better way, we can use a model to represent the various ecological processes that occur within the biosphere. One example of a model that we can use is the earth systems model.
E. systematic aorta
D. left ventricle
C. left atrium
A. pulmonary artery
B. superior venacava (i’m not sure if this one is right)
