The Circulatory System

What does the circulatory system transport?

• gases with the respiratory system

• Nutrients of the digestive system

• Wastes with the excretory system

• Hormones with the endocrine system

How does the circulatory system regulate body temperature?

• blood constricts to cool down the body

• Blood vessels dilate to warm up the body

How does the circulatory system protect against disease?

• blood contains germ-fighting cells

• Blood contains platelets, which help with blood clotting (self repair)

What are the 3 components of the circulatory system?

• heart

• Blood

• Blood vessels

What is the function of the heart?

• heart: muscular pumping mechanism

• Keeps the blood closing throughout our bodies

Define blood

• connective tissue that carries the oxygen and nutrients to our cells and carries waste away from our cells

State the function of blood vessels

• bring blood to lungs and the rest of the body

What are the types of blood vessels?

• arteries

• Veins

• Capillaries

What type of system is the circulatory system?

• the human circulatory system is a closed system

• There are no openings for the blood to leave vessels throughout the system

What type of system do simpler organisms have?

• some simpler organisms have an open circulatory system

• Blood (or a blood analogue) will leave vessels to bathe tissues before being re-collected

What are the two main circuits of the circulatory system?

• pulmonary circuit

• Systemic circuit

How does the pulmonary circuit work?

• Blood that circulates between the heart and lungs

• Moves deoxygenated blood to the lungs for gas exchange, and returns oxygenated blood to the heart

• Pulmonary = “pool of air”

How does the systemic circuit work?

• blood that circulates between the heart and the body

• Oxygenated blood flows from the heart to the body

• Deoxygenated blood is later returned to the heart

• Systemic = “system wide”

What is the coronary circuit?

• subset of systemic circulation

• Provides oxygenated blood directly to the heart muscle via the coronary arteries

• The right coronary artery supplies O2 to the right side of the heart

• The left coronary artery supplies O2 to the left side of the heart