Circulatory System Introduction Body Systems Unit Circulatory System Introduction

Catalyst Where is your heart located? How big do you think your heart is? What does your heart do?

The Circulatory System Day 1 The Circulatory System Also know as the Cardiovascular System

Taking your pulse (heart beat) Use two fingers (not your thumb, because it has a strong heart beat in it) Place them gently against the side of your neck or the inside of your wrist Silently count your heart beat for 15 seconds. NOW, take that number and multiply by 4 – The product is your heart’s current Beats Per Minute (BPM).

Let’s get moving! We are going to exercise for 30 seconds. You may either: Walk in place Jog in place Do jumping-jacks Now take your pulse again - record your BPM

Observation Time How did your heart-rate change? Walking? Running? Jumping Jacks? Based on what your classmates shared, which exercise got your heart pumping the fastest?

Functions of the Circulatory System

1. Delivers Oxygen All the cells in your body need oxygen to survive Your blood carries oxygen from your lungs to the rest of your body If your body cells do not get oxygen, they will die These red blood cells carry the oxygen

2. Delivers Nutrients You body cells also need nutrients, such as vitamins and minerals Your blood take nutrients and minerals to where they are needed

3. Removes Waste Your body cells also produce waste, like carbon dioxide, and your blood helps get rid of this waste. Your blood is like the delivery trucks and garbage trucks in your body

4. Fights Disease Your circulatory system also helps fight disease Your blood cells attack any invaders in your body Examples of invaders are bacteria and viruses

Functions of the Circulatory System Removes waste Fights disease Delivers Nutrients Delivers Oxygen

Parts of the Circulatory System What is blood? Special tissue that carries important gases and nutrients to and from all parts of your body. Blood is made up of 3 different types of cells that sit in a liquid called plasma.

3 Types of Blood Cells Red Blood Cells White Blood Cells Platelets

Red Blood Cells Red blood cells carry oxygen. They are shaped like small bowls. Why do you think we need red blood cells? These red blood cells carry the oxygen

White Blood Cells White blood cells protect us from disease They are “rough” looking with little bumps all over them. Why do we need White blood cells?

Platelets Platelets help blood clot (stick together) when you are cut or injured Why do we need platelets?

The Circulatory System Day 2 The Circulatory System Also know as the Cardiovascular System

Heart Beat Activity Put one of your hands on your desk palm up Open and close your hand at a steady beat Stop when your hand hurts or gets tired Who can keep going the longest?

Your Heart Your heart is about the size of your fist and it is constantly pumping blood throughout your body It can’t takes breaks, so it is a very strong muscle Bonus: What is the type of muscle found in the heart? CARDIAC MUSCLE

4 Parts of the Circulatory System Blood Lungs Heart Blood Vessels

Quick Review What are the three types of blood cells? Red Blood Cells (look like bowls and carry oxygen – remember red cereal bowl holds Cheerios “O”) White Blood Cells (look “rough” because they fight viruses and bacteria) Platelets (help blood clot. Just like how a dinner plate keeps red spaghetti sauce from running everywhere) Why do we need blood in the circulatory system?

Parts of the Circulatory System HEART Muscular organ that pumps blood all around the body. Why does the circulatory system need a heart to work?

Parts of the Circulatory System LUNGS Breathe in oxygen from the air and breathe out carbon dioxide (waste) from the body. Why would the circulatory system not work without the lungs?

Parts of the Circulatory System BLOOD VESSELS Blood travels through your body in hollow tubes called blood vessels. Remember closed circulatory systems from classification?!?

Types of Blood Vessels Arteries: Blood vessels that carry blood AWAY from the heart Veins: Blood vessels that carry blood TOWARDS the heart Capillaries: Very narrow blood vessels

Blood Vessels Why would the circulatory system NOT work without the blood vessels? ?

Why do your veins look blue? Blood with oxygen is red Blood without oxygen is blue. What color is the blood moving away from your lungs? What color is the blood moving toward your lungs?

Circulatory System is a Highway