Welcome to Access to HE Nursing: The Study Podcast. I'm Dr Sarah Mitchell, Lead Tutor for the nanoqual Access to HE Nursing pathway, and this is Episode 1, the cardiovascular system explained.
Let's start with the basics. The cardiovascular system has three core components: the heart, your muscular pump; the blood vessels, arteries, veins, and capillaries; and the blood itself, which carries oxygen, nutrients, hormones, and waste.
The heart has four chambers: two atria on top and two ventricles on the bottom. Deoxygenated blood from your body returns to the right atrium, drops into the right ventricle, and is pumped to the lungs through the pulmonary artery. In the lungs, it picks up oxygen, returns to the left atrium, drops to the left ventricle, and is pumped out through the aorta to the rest of the body.
The cardiac cycle, one complete heartbeat, takes about 0.8 seconds at rest. It has two main phases: diastole, when the chambers relax and fill, and systole, when they contract and eject blood. The "lub-dub" sound you hear through a stethoscope is the heart valves snapping shut at each phase transition.
Now, why does this matter for nursing? Because every clinical observation you take, pulse, blood pressure, capillary refill, is a window into how well this system is working. A weak, thready pulse tells you cardiac output is low. A blood pressure of 90/60 with a pulse of 120 tells you the body is compensating for something, maybe blood loss, maybe sepsis, maybe heart failure. Understanding the system means you can read those signs and escalate appropriately.
For your Access to HE assignment on this unit, you'll typically be asked to describe the cardiovascular system and apply that knowledge to a clinical scenario. The marking grid wants three things: accurate biological description, application to a real-world case, and use of academic sources.
I'll see you in Episode 2, where we'll tackle the respiratory system. Thanks for listening.