The atmospheric pressure drops so the partial pressure of O2 drops proportionately. The hemoglobin must circulate faster to deliver the same quantity of oxygen to working muscles' mitochondria for cellular respiration. This increased basal circulation rate places a greater demand for oxygen to support it, which triggers in increase in red blood cell population so there is more hemoglobin to deliver O2. With more RBCs the circulation rate once more slows to the old basal rate.
A.Afarensis,A. Africans, H.Habilis, H.Erectus, H.Sapiens
Answer:
Carbon Dioxide and Oxygen
Explanation:
Photosynthesis takes up our Carbon Dioxide and as a bi-product it releases Oxygen.
Humans have 22 of these chromosome pairs, called autosomes. Humans have an additional pair of sex chromosomes for a total of 46 chromosomes. The sex chromosomes are referred to as X and Y, and their combination determines a person's sex. Human females have two XX chromosomes while males<span> possess an XY pairing.
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