International Journal of Humanities Social Sciences and Education
By Vitharana, P.R.K.A.
“Secondary School Learners Conceptions of the Structure and Function of the Human Circulatory System”
Publisher:
4/8
Pp. 283-292
2021
Secondary School Learners Conceptions of the Structure and Function of the Human Circulatory System
Type: Empirical
Data collection method: Test
Number of subjects, range: Large — 31 or more
Grade and age of subjects: Adult — over 18 years
- Human circulation is a double circulation since there are left and right sides in the heart.
- Human circulation is a double circulation since there are arteries and veins.
- The walls of arteries are thicker than walls of veins because arteries transport oxygenated blood and veins transport deoxygenated blood.
- The walls of ventricles are thicker than walls of atria because there is a larger amount of blood in the ventricles.
- The walls of the ventricles are thicker than the walls of the atria to withstand the pressure exerted by the atria.
- Deoxygenated blood form the body enters the left atrium.
- During atrial systole, semi-lunar valves open and blood flows into the aorta and pulmonary artery.
- During atrial systole bicuspid valve and tricuspid valve open and blood flows into aorta and pulmonary artery.
- Blood on the left side of the heart is different from blood on the right side since it contains deoxygenated blood brought from pulmonary veins.
- In the process of gas exchange between alveolar sac and blood capillaries, CO2 diffuses form alveolar sacs to blood capillaries, and O2 diffuse form blood capillaries to alveolar sacs.