Lifestyle and the Circulatory System (Leaving Cert Biology): Revision Notes

Lifestyle and the Circulatory System

Effect of Diet on the Circulatory System

• A high-fat diet causes a build-up of cholesterol. Cholesterol can block arterioles and increase the risk of stroke or heart attack.
• High salt intake raises blood pressure, increasing the risk of a heart attack.

Effect of Smoking on the Circulatory System

• Carbon monoxide (CO) reduces the amount of oxygen (O₂) carried by the blood, lowering energy levels.
• Nicotine raises the heart rate and blood pressure, increasing the heart's workload.
• Chemicals in tobacco increase the risk of blood clots.

Effect of Exercise on the Circulatory System

• Regular exercise strengthens the heart, leading to improved circulation.
• Exercise enhances the body's ability to transport oxygen, increasing energy levels.