Test 3 chapter 6+7

Question 1

What is plasma

Answer 1

It is the liquid part of the blood and is yellow in colour it is made up of mostly water and helps carry heat around the body

Question 2

What do white blood cells do

Answer 2

They fight infection and digest bacteria

Question 3

What are red blood cells

Answer 3

Red blood cells contain haemoglobin to carry oxygen. It is a red substance containing iron

Question 4

What are platelets

Answer 4

They help with blood clotting

Question 5

Describe the arteries

Answer 5

They have a thick wall. They carry blood away from the heart under high pressure

Question 6

Describe capillaries

Answer 6

They have a tiny thin wall. They allow materials in and out of the blood

Question 7

Describe veins

Answer 7

They have a thin wall. They carry blood to the heart and the blood is under low pressure so veins have valves to stop back flow

Question 8

Nose

Answer 8

We inhale through are nose. It warms and moistens the air and hair traps dust and bacteria

Question 9

Trachea

Answer 9

Carries air to and from the bronchus

Question 10

Bronchus

Answer 10

Carries air into and from the lungs

Question 11

Bronchiole

Answer 11

Branch of branches that carries air to and from the alveoli

Question 12

Alveolus

Answer 12

Tiny air sac in the lungs. There are millions in each lung. They are the site of Gas exchange where CO2 diffuses into blood

Question 13

What is the diaphragm

Answer 13

The diaphragm muscle and the muscle between the ribs cause air to flow in and out of the lungs

Question 14

Name the 4 things in our blood

Answer 14

Plasma
• Red blood cells
• White blood cells
• Platelets.

Question 15

Define the term chambers

Answer 15

The heart contains four chambers. The top two are the right atrium and the left atrium (plural atria) and the bottom two are the right and left ventricles.

Question 16

Define the term septum

Answer 16

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

Question 17

Define the term heart valves

Answer 17

Valves in the heart make sure that blood can flow only in one direction. In this way, they are similar to valves in a car tyre or football (which let air pass in, but not out).

Question 18

What is a pulse

Answer 18

When blood is pumped through the arteries, the pressure causes the arteries to expand.

Question 19

Define the term excretion

Answer 19

Excretion is the getting rid of the waste products of reactions from the body.

Question 20

Name the 6 functions that make up the breathing system

Answer 20

Nose
Trachea
Bronchi and bronchioles
Alveoli
Diaphragm
Ribs and intercostal muscles.

Question 21

Describe what happens in the respiration system when a person breaths in?

Answer 21

When a person breathes into their nose, the diaphragm contracts move down lungs expand and the trachea carries air into the lungs. The bronchioles carry air to the alveoli where oxygen passes from the alveoli into the bloodstream.