Circulatory System

Question 1

Open vs Closed circulatory system

Answer 1

Open:Blood is not entirely contained in the blood vessels. Blood is pumped by a tubular heart into blood vessels and spongy chambers called sinuses.
Closed: Blood remains within blood vessels, nutrients, waste and O2 move in and out through the thin walls of the smallest blood vessels. More efficient circulation.

Question 2

Other name for circulatory system?

Answer 2

Cardiovascular system

Question 3

What are the 2 types of circulatory systems?

Answer 3

Open and Closed

Question 4

Function of the circulatory system?

Answer 4

Supplies trillions of cells with water, nutrients and O2 and removes CO2 and other wastes, it regulates body temp., helps heal wounds and fight infection.

Question 5

How much blood do you contain?

Answer 5

4 to 6 L

Question 6

What is blood made of?

Answer 6

Liquid: Plasma
Solid: RBC, WBC (leukocytes), Platelets

Question 7

Plasma

Answer 7

55% of blood is plasma and 90% of plasma is water
Helps regulate body temp. The remaining 10% is protein, nutrients and wastes such as CO2. Plasma proteins transport fatty acids and vitamins and fight infections.

Question 8

RBC

Answer 8

45% of blood is mostly RBC. RBC carries O2 from lungs to all the tissues of the body. 1mm cubed contains about 5 million RBCs. Every RBC contains about 250 million molecules of hemoglobin. Once O2 s gone, Rbc carries CO2 to the lungs.

Question 9

Hemoglobin

Answer 9

A protein that binds O2 in the lungs and releases it throughout the body.

Question 10

Why is blood red?

Answer 10

O2 binds to the iron portion of hemoglobin.

Question 11

Where are RBC produced?

Answer 11

Bone Marrow. Produced at 2 million/1s in a healthy adult.

Question 12

What is the advantage of the shape of RBC?

Answer 12

It’s inward curve in the middle, caused by the loss of the nuclei and mitochondria, increases the SA. Also gives flexibility to pass through blood vessels of differnet shapes and sizes.

Question 13

Life of RBC?

Answer 13

Lifespan: 100-120 days

Is broken down and the iron from the old blood cell is returned to bone marrow to produce new RBC.

Question 14

WBC function?

Answer 14

Fight infection, bacteria and parasites. They can move outside of the blood vessels when they are needed to fight foreign bodies.

Question 15

Quantity of WBC?

Answer 15

Around 4 000 and 11 000 WBC in 1mm cubed, except when fighting infections, then the amount dramatically increases.

Question 16

Life of a WBC?

Answer 16

Lifespan: WBCs keep their nuclei and thereefore they can live for years, they are also formed in bone marrow.

Question 17

How does your blood clot?

Answer 17

The help of plasma proteins and platelets.