A&P Chapter 2 Test

Understanding ________ is essential for understanding anatomy and physiology because body structures and functions result from chemical changes.

Which of the following substances is not an element?

• Iron

• Oxygen

• Water

• Carbon

• Hydrogen

Matter is anything that has weight and takes up space.

• True

• False

Which elements make up 95% (by weight) of the human body?

• carbon, hydrogen, oxygen, nitrogen

  
  

• carbon, hydrogen, oxygen, calcium

  
  

• carbon, hydrogen, calcium, nitrogen

  
  

• carbon, hydrogen, selenium, sodium

  
  

The number of protons in the atoms of a particular element is called the element’s _______.

• Atomic mass

• Atomic number

• Atomic weight

The atomic weight of an atom of an element equals the number of _______ in its nucleus.

• protons

• neutrons

• electrons

• protons & neutrons

Each element is composed of characteristic tiny particles called _______.

The parts of an atom that lack an electrical charge are called _______.

When atoms combine with other atoms, interactions occur between their ________ shells.

Name a major element.