PSB Natural Science Exam

The circulatory system can be thought of as the blood distribution system. - which system can be thought of as the blood distribution system? The circulatory system is a system that passes nutrients (such as amino acids, electrolytes and lymph), gases, hormones, blood cells, etc. to and from cells in the body to help ght diseases, help stabilize body temperature and pH. - What are examples of nutrients circulated via the circulatory system? The primary purpose of the digestive system is to convert food into a form that can provide nourishment for the body. - What is the primary purpose of the digestive system? Digestive juices such as gastric acid are formed in the stomach. It has a pH of 1 to 2 and is composed of hydrochloric acid (HCl) (around 0.5%, or 5000 parts per million), and large quantities of potassium chloride (KCl) and sodium chloride (NaCl). The acid plays a key role in digestion of proteins, by activating digestive enzymes, and making ingested proteins unravel so that digestive enzymes can break down the long chains of amino acids. - Which element in the digestive process helps break down food? The respiratory system is the anatomical system of an organism that introduces respiratory gases to the interior and performs gas exchange. The anatomical features of the respiratory system include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood. This exchange process occurs in the alveolar region of the lungs. - What is the respiratory system? a. The respiratory system consists of all the organs involved in breathing. b. Organs included in the respiratory system are the nose, pharynx, larynx, trachea, bronchi and lungs. c.The respiratory system conveys oxygen into our bodies and removes car- bon dioxide from our bodies. - Which, if any, of the following statements about the respiratory system are true?