Cations

Definition

Cations are positively charged ions that occur when an atom loses one or more electrons. They are essential in various biological processes, including nerve impulse transmission and muscle contraction.

5 Must Know Facts For Your Next Test

1. Cations are formed by the loss of electrons from neutral atoms.
2. Common examples of cations include Na+, K+, Ca2+, and Mg2+.
3. In biological systems, cations play a crucial role in maintaining cellular function and homeostasis.
4. The positive charge of cations attracts negatively charged anions to form ionic bonds.
5. Cations are often involved in signal transduction pathways within cells.

Review Questions

• What is a cation and how is it formed?
• Name three common cations found in biological systems.
• Why are cations important for cellular functions?

Related terms

Anions: Negatively charged ions that result from an atom gaining one or more electrons.

Ionic Bond: A type of chemical bond formed between oppositely charged ions, such as cations and anions.

Electrolytes: Substances that dissociate into ions in solution and conduct electricity, commonly including both cations and anions.