Chapter 32

Chapter 32 - November 9, 2011 CHAPTER 32 CIRCULATION Parts...

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November 9, 2011 CHAPTER 32 CIRCULATION Parts of circulatory systems 1.) Fluid that circulates (blood) 2.) Channel (vessels) that fluid circulates through 3.) Pump (heart) to keep fluid moving There are animals out there that lack the circulatory system. o They must be really thin and small. o They still really on oxygen moving to high concentrations to low oxygen concentrations. o Their cells still need to get oxygen. Types of circulatory systems 1.) Open circulatory system 2.) Closed circulatory system We have a closed circulatory system. Our body controls our blood through a number of pipes. A grasshopper has an open circulatory system. The blood fills up the entire body. o It has a very large volume of blood compared to the closed circulatory system of the earthworm. Invertebrates do not have a back bone In this chapter we will look at animals that have vertebra (backbone) Functions of the Vertebrate circulatory system 1.) Carry oxygen, nutrients, and waste o Carry oxygen to every single cell in your body, remove waste from every single cell in your body, and carry nutrients to every single cell in your body. o The Living cells in your body require all 3 of these things to live and survive and keep you alive. 2.) Distribute hormones o Hormones go to every single cell in your body but only certain ones respond. 3.) Regulate body temperature o If you get really hot, your cheeks turn red and your body is bringing blood flow to your cheeks so you can cool off quicker. o It can also help conserve heat in your body. 4.) Prevent blood loss o Blood clotting 5.) Defend against diseases o White blood cells play a central roll in defense against disease Vertebrate Hearts 3 flavor of hearts Humans have a 4-chamber heart. Some animals can have 3 or 2 chamber hears. Hearts do not require the brain to keep pumping. 2 chambers- fish (simplest of the hearts in the animal kingdom) 3 chambers- amphibians, reptiles o Exceptions are some crocodiles are starting to form a 4 chamber heart 4 chambers- birds, mammals o Birds and reptiles are part of the same family tree, so those birds some how evolved o 4 chamber hearts arose twice separately. Chambers are atria or ventricles The fish has one atrium and a ventricle In the fish deoxygenated blood is in the atrium and then enters the ventricle and then goes to the gill capillaries and then keeps moving now with oxygen in it all the way to the body capillaries. The oxygen
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comes from when it passes through the gill capillaries. The blood returns back to the atrium and then the process occurs over again. o
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Chapter 32 - November 9, 2011 CHAPTER 32 CIRCULATION Parts...

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