PTS 14

The bar chart below shows how the number of cigarettes smoked is linked to the percentage of deaths from heart disease in the total male population. Which statements correctly describe the data. Choose all that apply.

• As the number of cigarettes increases, the risk of heart disease increases

• As a person gets older, their risk of heart disease increases

• Smoking has a greater effect on risk of heart disease in older people

• Males are at higher risk of heart disease than women

The diagram below shows bones and muscles of the human arm. The biceps and triceps are muscles that contract to move the bones of the lower arm.

What do the biceps and triceps do to move the arm in the direction shown by the arrow?

• The biceps and the triceps contract at the same time

• The biceps contracts and the triceps relaxes

• The biceps relaxes and the triceps contracts

• The biceps and the triceps relax at the same time

Which is not a function of the skeletal system?

• To support the body

• To allow the body to move

• To sense changes in the environment

• To protect organs of the body

Howard Florey and Ernst Chain are credited with being the first to manufacture penicillin. To do this, they looked at the work of earlier scientists, including Alexander Fleming. What does this tell us about scientific discoveries?

• Data from old experiments are not useful in making new discoveries

• Scientific problems can only be solved by a group of people

• Scientists can only make new discoveries if they work independently

• Scientists can look at old observations in a new way to help make discoveries

Joanne measured the volume of air she breathed in and out of her lungs. The graphs represent the volume of air Joanne breathed in and out with each breath before and during exercise.

Why did Joanne breathe in more air during exercise?

• Cells require more water to regulate temperature

• Cells require more nutrients over time

• Cells need more oxygen during exercise

• Cells need more protein to build muscle during exercise

Which statement about bacteria is not true

• Bacteria can cause food to spoil

• Bacteria in the gut help to break down food

• Bacteria are used in the production of yoghurt

• All bacteria are harmful

An organ system is...

• a collection of organs working together to do an important job

• a collection of tissues that do the same job

• a collection of organs that help us breathe

• a way of counting the number of organs in the body

Lactic acid is produced in your muscles and builds up during intense exercise. It can lead to painful, sore muscles. How is lactic acid removed?

• Lactic acid is converted into a neutral substance in the muscles

• Lactic acid is broken down in the liver and muscles in the presence of oxygen

• Lactic acid is transported to the intestines and digested

• Lactic acid is released through the skin in the form of sweat

Moaza measures the mass of her laptop. Which unit should she use

• metres

• pounds

• milligrams

• kilograms

Use the periodic table to help you decide which statement is correct

• Hydrogen (H) has more protons than iron (Fe)

• Lithium (Li) has more protons than helium (He)

• Argon (Ar) has more protons than calcium (Ca)

• Oxygen (O) has more protons than argon (Ar)