WorksheetsRevisione Anno III
Total questions: 16
Worksheet time: 10mins
Insulin is one of many human proteins that are made by genetically engineered bacteria.
Some people cannot produce insulin because their immune system has destroyed the cells that make insulin.
State the name of the disease caused by the destruction of these cells.
Eye lashes and eye lids are mechanical barriers that help to prevent particles and pathogens entering
the eye. State the name of the white blood cells that digest pathogens.
phagocytes
monocytes
red blood cells
lymphocyte
Which are both chemical barriers to the transmission of pathogens?
A mucus and stomach acid
B mucus and white blood cells
C skin and hairs in the nose
D skin and stomach acid
Which body defence is a chemical barrier?
A antibody production
B hairs in the nose
C mucus lining the airways
D skin
What is a pathogen?
A a bacterium
B a disease-causing organism
C a disease that is transmissible
D a white blood cell that engulfs bacteria
Carbon dioxide is one of the components of inspired and expired air.
State the name of the chemical used to test for the presence of carbon dioxide
What helps oxygen to be absorbed rapidly into the blood in the lungs?
A Air breathed in has less oxygen than air breathed out.
B Alveoli have thick walls and a large surface area.
C Alveoli have thin walls and a large surface area.
D The concentration of oxygen in the blood is higher than in the alveoli.
A girl holds her breath for 30 seconds, breathes out, and then breathes in.
Compared with the air she breathes out, the air she breathes in contains less
A carbon dioxide and water vapour.
B nitrogen and water vapour.
C oxygen and carbon dioxide.
D oxygen and nitrogen.
What makes alveoli suitable as a gas exchange surface?
A
B
C
D
Respiration occurs in all living organisms.
The diagram shows how ethanol can be produced from a sugar solution containing yeast.
After five hours the mixture produced bubbles.
What is the main gas in the bubbles?
A air
B carbon dioxide
C methane
D oxygen
The table shows information about urea.
Which row is correct?
A
B
C
D
What is the most important function of sweating?
A to remove excess heat from the body
B to remove excess salts from the body
C to remove excess urea from the body
D to remove excess water from the body
The diagram shows some organs in the human body.
In which part are amino acids broken down to form urea?
A
B
C
D
What is a function of the kidneys of a healthy person?
A break down toxins
B eliminate all salts
C reabsorb all glucose
D retain all water
In which form is the greatest quantity of nitrogen excreted from the mammalian body?
A amino acids
B nitrates
C proteins
D urea
