Answer: A) The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.
Explanation:
The endometrium can be defined as the inner layer of the epithelium. It along with the mucous membrane forms the covering of the mammalian uterus. It is the basal and functional layer of the uterus. This layer thickens and then shed during the menstruation cycle in humans and in some other mammals including the apes, monkeys, bats and elephants. But the endometrium layer is reabsorbed in the estrous cycle.
Oxygen and carbon dioxide are the gases transported by the red blood cells. Oxygen is collected from the air in the alveoli to the blood capillaries. It binds to the heme group in <span>the haemoglobin<span>, which confers the red colour to the red blood cells where it is contained. </span></span>Carbon dioxide moves the other way around, from capillaries to alveoli. They are transported by the red blood cells when oxygen is exchanged by carbon dioxide from the cells' metabolism.
