Unit 2 - Unit Two Biological Sciences Homeostasis The...

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Unit Two Biological Sciences Homeostasis The ability to maintain a relatively constant body temperature and blood pressure and regular system functions Mechanisms for maintaining homeostasis Two responses : positive and negative o Negative feedback System tell body something is wrong Body reacts Presperation when someone is hot o Positive Feedback An action of the body until a certain point is reach Oxytocin, a chemical during birth, is released until uterine contractions are large enough to give birth Can be bad when comes to fever, body doesn’t stop heating up Chapter 5 The functions of the cardiovascular system What’s the Cardiovascular System? Heart and Blood Vessels Brings nutrients to cells and gets rid of wastes Blood is refreshed in lung, kidneys, intestine and liver o Lungs oxinate blood o Kidneys remove waste o Intestine and liver bring in nutrients Lymphatic vessels help this system by collecting excess fluid surrounding tissues and return it to the cardiovascular system Functions of Cardiovascular System Generate blood Pressure o If not enough blood flow, organs shut down o Too much blood flow, lungs fill with fluid Transport Blood Exchange of Nutrients and wastes at the capillaries o Hormones regulate body functions Pathway of Blood Heart – Arteries – Arterioles – Capillaries – Venules – Veins – Heart
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