The Circulatory System A Bloody Situation

The Case of the Missing Jewels Late one April night, government agents received an anonymous tip that the National Art Museum was about to be robbed of its priceless jewel collection! When they arrived a the museum, they saw they were too late: the jewels were gone. There was no one around, but there was evidence of a struggle. Blood was spattered all over a nearby wall. In another area, there was a smeared pool of blood. Hidden in the corner, investigators found a bloody knife.

Your Mission You and your partner are investigators on the scene. Your job is to identify the blood and narrow down the suspects. Based on what you know about blood, come up with at least 3 forensic questions that could be answered by analyzing the blood.

Human Blood Major Components: BRAINPOP 1) Plasma 2) White Blood Cells 3) Red Blood Cells 4) Platelets

Suspended Materials Dissolved gases (CO2) Salt Glucose Amino acids Hormones Urea (wastes)

RED Blood Cells Bi-concave shape & no nucleus Smaller than WBC 5 million per ml (most numerous!) Produced in bone marrow Live for 120 days Contains hemoglobin which carries oxygen! (forms oxyhemoglobin) Responsible for blood type

The “army” of the circulatory system Fights foreign invaders (infection, viruses, allergens, bacteria) WHITE BLOOD CELLS Fewest in number Produced in bone marrow Have a nucleus Largest Most only live for a few days

Platelets Very small Needed for blood clotting Fragments of WBCs Not as many as RBCs Needed for blood clotting Releases clotting factors and forms fibrin

Blood Types

As blood flows through the circulatory system, it moves through three types of blood vessels 1- arteries 2- capillaries 3- veins

Connects arteries to veins BRAINPOP smallest (only one cell thick!) Connects arteries to veins Sites where gases, nutrients and wastes are exchanged (diffuse into/out of blood) carries blood back TO the heart from the body VEINS have VALVES to prevent backflow of blood! thickest, most muscular blood vessels Must withstand powerful pressure produced when the heart contracts Carries blood AWAY from heart

THE BLOODMOBILE!!! Blood carries oxygen and nutrients away from the heart toward the body tissues! Blood carries carbon dioxide and wastes back to the heart to be pumped to the lungs!

Let’s Review Blood Vessels! Capillary Vein Artery

The Heart Large organ composed of thick muscle 4 chambers 2 atria (top) 2 ventricles (bottom) Circulatory system - YouTube

1. AORTA (largest artery – pumps oxygenated blood to body tissues) 13. Pulmonary Artery (“Pulmonary =Lungs”) 2. PULMONARY ARTERY (pumps deoxygenated blood to lungs) 12. Superior Vena Cava 11. Right Atrium (pumps deoxygenated blood into right ventricle) 3. PULMONARY VEINS (pumps oxygenated blood from lungs to left atrium) 10. Inferior Vena Cava (carries deoxygenated blood from body to right atrium) 4. Left Atrium (pumps oxygen rich blood to left ventricle 6. Left Ventricle (pumps oxygenated blood into aorta) 9 & 5. Valves (prevents backflow of blood) 8. Right Ventricle (pumps deoxygenated blood into Pulmonary Artery) AORTA 7. Septum (divides the 2 sides of heart (prevents mixing of blood)

Types of Circulation the heart functions as 2 separate pumps Pulmonary Circulation: the right side of the heart pumping blood to the lungs where oxygen is absorbed and carbon dioxide is released Systemic Circulation: the left side of the heart pumps oxygen-rich blood that is returning from the lungs, away from the heart to the rest of the body Coronary Circulation: the movement of blood through the vessels serving the heart muscle

Homework

Disorders of the circulatory system

#1 Healthy or unhealthy? Disease?

#2 Healthy or Unhealthy? Disease?

#3 Healthy or Unhealthy? Disease?

#4 Healthy or Unhealthy? Disease?

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