Topic 4- Body systems

Question 1

Molecule

Answer 1

two or more atoms joined (bonded) together, forming a small particle

Question 2

Organelles

Answer 2

small structure in a cell with a special function

Question 3

Cells

Answer 3

the smallest unit of life. Cells are the building blocks of living things. There are many different sized and shaped cells in animals and plants, as well as single-celled organisms.

Question 4

Tissues

Answer 4

groups of cells performing the same function

Question 5

Systems

Answer 5

group of organs working together

Question 6

Cellular respiration

Answer 6

the chemical reaction involving oxygen that moves the energy in glucose into the compound ATP. The body is able to use the energy contained in ATP.

Question 7

Respiratory system

Answer 7

the body system involving the lungs and associated structures, which take in air and supply the blood with oxygen to deliver to the body’s cells so they can carry out their essential functions; it also performs gas exchange to remove the waste gas carbon dioxide

Question 8

Digestive system

Answer 8

a complex series of organs and glands that processes food to supply the body with the nutrients it needs to function effectively

Question 9

Excretory system

Answer 9

the body system that removes waste substances from the body

Question 10

Circulatory system

Answer 10

the body system that circulates oxygen in blood to all the cells of the body. The circulatory system consists of the heart, the blood vessels and blood.

Question 11

Blood Cells

Answer 11

the red liquid that circulates around the body. It is made up of plasma, blood cells and platelets.

Question 12

Blood Vessels

Answer 12

the veins, arteries and capillaries through which the blood flows around the body

Question 13

Heart

Answer 13

a muscular organ that pumps blood through the circulatory system so that oxygen and nutrients can be transported to the body’s cells and wastes can be transported a

Question 14

Arteries

Answer 14

hollow tubes (vessels) with thick walls carrying blood pumped from the heart to other body parts

Question 15

Capillaries

Answer 15

minute tubes carrying blood to body cells. Every cell of the body is supplied with blood through capillaries.

Question 16

Veins

Answer 16

blood vessels that carry blood back to the heart. They have valves and thinner walls than arteries.

Question 17

Musculoskeletal system

Answer 17

consists of the skeletal system (bones and joints) and the skeletal muscle system (voluntary or striated muscle). Working together, these two systems protect the internal organs, maintain posture, produce blood cells, store minerals and enable the body to move.

Question 18

Reproductive system

Answer 18

the body system involving the reproductive organs, which differ between males and females

Question 19

Nervous system

Answer 19

the system of nerves and nerve centres in an animal in which messages are sent

Question 20

Endocrine system

Answer 20

the body system of glands that produce and secrete hormones into the bloodstream to regulate processes in various organs