Biology Unit revision

Which phrase best summarises the overall role of the respiratory system?

• Gas exchange

• Taking in oxygen

• Removing carbon dioxide

• Filtering air

Identify the gas we excrete as waste via our lungs.

• Oxygen

• Helium

• Carbon dioxide

• Nitrogen

The process of bringing oxygen into the lungs is called:

• Breathing

• Respiration

• Excretion

• Oxygenation

Which is the major muscle that aids in breathing?

• Oesophagus

• Trachea

• Bronchus

• Diaphragm

The stomach:

• Stores food and helps break it down using acid

• Absorbs water and other substances

• Breaks down fats and destroys poisons

• Produces enzymes for saliva

From which body system does the circulatory system absorb nutrients?

• Reproductive

• Digestive

• Excretory

• Respiratory

Cell theory states that cells are:

• Small

• The basic unit for life

• Organelles

• Non-living

What are the smallest vessels of the circulatory system called?

• Arteries

• Capillaries

• Veins

• Alveoli

What is the function of the mitochondria in a cell?

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Multicellular organisms are defined as:

• Living things composed of one cell

• Living things that are prokaryotic

• All living things from the domain Eukarya

• Living things that are composed of two or more cells