Summary:Cardiology is the study of the heart. Considering this is just one muscle, the heart is every complex and controls everything we do. from everything from breathing to exercising. The heart is the pump the keeps us going.

What foods are good for your cardiovascular system? Here is a great link for food/ cooking tips to make sure you stay healthy!
Heart Healthy Foods


How would cardiology play a roll in my career?
Understanding cardiology is a huge part of my career as nurse because heart disease is one of the leading killers is the USA. Working with the baby boomer generation, heart disease is increasing yearly. This generation will be the ones that I will take care everyday. It is important that understand the effects of blood pressure and what high/low pressure can do to the human body so it helps me understand what might be going on with my patients. Also, understanding the cardiovascular system will help me take care or people that have heart disease, CHF, or any other heart defect. It is also a huge part of my job as a nurse to take vital signs of patient and detect if anything is unusual.
Statistics of the heart:
Heart Health

What are the three most important variables that affect blood pressure?
1. Cardiac output
2. Peripheral resistance
3. Blood volume

Describe each variable and how it affect blood pressure.
1. Cardiac output
is the Stroke volume x heart rate=CO This affects blood pressure by increasing one of the variables leads to an increase in blood pressure.
  • A. increased stroke volume = increased blood pressure
  • B. Increased CO = increased blood pressure
  • C. Increased heart rate = increased blood pressure

2. Peripheral resistance is the resistance of blood flow through the arterial system.
  • A. Arteriole constriction = increases blood pressure
  • B. Arterial dilation = decreases blood pressure

3. Blood flow is the amount of blood flowing in the body. This can either increase or decrease depending of the circumstances

  • A. Increase in salt/ fluid intake = increased blood pressure
  • B. Hemorrhaging = decreased blood pressure

Describe two reflexes that help maintain blood pressure within limits.
Baroreceptor reflex and atrial stretch reflexes.


The Baroreceptor reflex help maintain blood pressure by producing a baseline frequency of action potentials in sensory neurons. When blood pressure rises the carotid and walls or the aortic sinuses stretch therefore a decrease in blood pressure will occur.

The Atrial stretch reflexes
are started by atrial stretch receptors that are activated by an increase of venous return. In response to the increase the body stimulates fast heart beat, inhibits ADH hormone and increased amounts on ANP.This all will help lower blood pressure by excreting water and salt.

Fun Fact:The first known transfusion of blood was performed as early as 1667, when Jean-Baptiste, transfused two pints of blood from a sheep to a young man.

Thanks to:
Human physiology 11th edition -McGraw-Hill