The CV System

In Glogpedia

by 10connollyc
Last updated 5 years ago

Discipline:
Science
Subject:
Human Anatomy
Grade:
12

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The CV System

The main vessels that transport blood are the arteries and veins. Arteries carry blood away from the heart where as, veins carry blood to the heart. Arteries have smaller lumen and thicker walls compared to the viens as the blood that flows through them is a higher pressure than blood that flows through veins. The arteries break off into arteioles and then into capilaries, where it is taken to muscles. Viens break off into venuols, which also go into capilaries and the blood is taken to the heart.

The Cardiovascular System

Blood Flow Through The Heart

Blood is made up of plasma, erythrocytes, heamaglobin, platelets and leucytes. Plasma is a sticky substance that acts a a transport for formed elemements.Erythrocytes are disc shaped with a concave. They transport oxygen to tisues and carbon dioxide from tisues. Heamaglobin, binds with oxygen and is a protien that makes red blood cells a dark red colour. Plateletts are small bone marrow cell fragments that are scattared between blood cells and they help to prevent blood loss by forming clots. Leucocytes or white blood cells defend against bacteria, virases and parasites.

Components Of Blood

The blood is responsible for the delivery and transport of oxygen to the lungs and the body. It also carries platelets that form clots to stop blood loss and keep bacteria out of a wound. The blood also carries white blood cells which are essential for fighting infection as they can be rapidly roduced if they come across any virases, bacteria or parasite in the blood stream.

Function Of The Blood

Oxygen and nutrients are delivered in the bloodstream to different parts of the body. Glucose and nutrients are absorbed into the blood from the food digested in the stomach and through the intestines and the nutrients. The nutrients and the oxygen are absorbed by cells to be used for different bodily processes. When heart rate increases, the delivery of oxygen and nutriants also increases.

Delivery Of Oxygen And Nutrients

The circulatory system carries the waste products from tissues in different parts of the body to the kidney and the liver. It also returns carbon dioxide from the tissues back to the lungs. The CV sytem removes waste such as carbon dioxide that is produced during respiration. During excersise, respiration is increased and more CO2 is released into the lungs to be released when you exhale.

Removal Of Waste Products

Thermoregulation is the bodies way of maitaining its internal temprature. When the body becomes too hot your body performs vasodialtion to cool down and visoconstruction to heat you up if your body temprature is too high. The intensity of excersise will determin which method of thermoreugulation is used.Vasodialtion happens when your body temrature is high. The blood vessles relax and dialate to allow more blood in.Vasoconstruction happens when your bodies tempratue is low. it performs this proces in order to heat you up. The blood vesels temporarily close to stop blood flow to tissues. The diameter of the blood vessels decreases and heat loss in the skin is reduced.

Thermoregulation

Capilaries


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