Chapter 6 The Circulatory System

Question 1

Describe the changes of the blood that takes place in the intestines and the lungs.

Answer 1

Intestines: blood gains food water and carbon dioxide. Blood loses oxygen.
Lungs: blood gains oxygen. Blood loses Carbon dioxide and water.

Question 2

Name the blood vessel that takes blood (a) From the heart to the lungs. And (b) From the arms and legs to the heart

Answer 2

(A) The pulmonary artery
(B) Vena Cava

Question 3

The four parts of blood.

Answer 3

Plasma
Red blood cells
White blood cells
Platelets

Question 4

Which part of our blood is a liquid.

Answer 4

Plasma

Question 5

Name the part of blood that Is responsible for (i) Fighting infection
(ii) Transporting glucose.
(iii) Preventing blood loss.
(iv) Carrying heat
(v) Making antibodies.
(vi) Supplying oxygen to our cells.

Answer 5

(i) White blood cells
(ii) Plasma
(iii) Platelets
(iv) Plasma
(v) White blood cells
(vi) Red blood cells

Question 6

Which type of blood vessel allows materials to pass in and out?

Answer 6

Capillaries

Question 7

Why do arteries tend to lose more blood then cut veins do?

Answer 7

Because the blood pressure inside the arteries tends to be much higher than that in the veins.

Question 8

Why can we not detect a pulse in the vein?

Answer 8

Veins don’t pulsate.

Question 9

What blood does

Answer 9

Plasma= Transporte materials such as foods and wastes and also transport heat around the body.
Red blood cells=Transport oxygen.
White blood cells= fight infection.
Platelets= clot the blood.

Question 10

Arteries

Answer 10

Arteries carry blood AWAY from the heart.

Question 11

Veins

Answer 11

Carry blood to the heart

Question 12

Capillaries

Answer 12

Are tiny blood vessels that are found between arteries and veins.

Question 13

The heart

Answer 13

Is made of a special type of muscle called cardiac muscle. Caridad muscle is very strong and doesn’t tire easily. Cardiac means anything related to the heart

Question 14

Structure of the heart.
Parts of the heart;

Answer 14

Chambers: The heart contains 4 chambers. The top two are the right atrium and the left atrium and the bottom two are the left and right ventricles.

Septum: The two sides of the heart are separated by a muscular wall called the septum

Heart valves: Valves in the heart make sure blood can flow in only one direction.

Question 15

How blood flows through the heart

Answer 15

Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body’s tissues through the aorta.

Question 16

The ventricles of the heart.

Answer 16

The right ventricle pumps blood from the heart to the lungs. This is a reasonably short distance, and so the muscular walls of the right ventricle and fairly thin.

The left ventricle pumps blood from the heart all around the body. This is a very long distance and so the muscular walls of the left ventricle are very thick.

Question 17

Pulmonary artery and vein

Answer 17

Most of the arteries in the blood carry oxygen rich blood. However, the pulmonary artery is an exception to this rule, as it carries blood low in oxygen.

Most of the veins in the body carry blood. However, the pulmonary vein is exception to this rule, as it carries oxygen rich blood.

Question 18

The two blood circuits.

Answer 18

The circulatory system consist of two circuits.

In the lung circuit, blood flows from the heart to the lungs mas back to the heart.

In the longer body circuit, blood flows to the heart to the rest of the body and back to the heart again.

Question 19

What is a pulse

Answer 19

When blood is pumped through the arteries, the pressure causes the arteries to expand, this wave of pressure is called a pulse.