Are We Happier Than Our Forefather

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Science Form 3 note

SMART STUDY - GOOD LUCK

Teacher zaidi@maher2010

CHAPTER 2: BLOOD CIRCULATION AND TRANSPORT
BLOOD CIRCULATION AND TRANSPORT

HUMAN BEING Function of heart Structure of heart
Blood vessels: characteristics and functions

PLANTS Wilting
Transpiration: function of stomata, factors affecting the rate, its roles

Xylem and phloem

Oxygenated blood and deoxygenated blood

Path of blood flow Role of circulatory system
Constituents of blood and functions

Blood groups Blood groups of donor and recipient Importance of blood donation

1. TRANSPORT SYSTEM IN HUMAN A. STRUCTURE OF THE HUMAN HEART

Go to www.kidshealth.org/kid/body/mybody_SW.html click on `heart’.. 1. General structure of the human heart: a. The human heart is located inside the thoracic cavity, behind the breastbone and between the left and the right lung. b. The heart is cone-shape and its tip tilts slightly towards the left side of our body.

Science Form 3 note c.

SMART STUDY - GOOD LUCK

Teacher zaidi@maher2010

The heart has a mass of about 300 g and is built of thick and strong cardiac muscle. 2. detailed structure of the human heart: a. the human heart possesses four muscular chambers: i. two chambers on the left side; left atrium and left ventricle ii. two chambers on the right side; right atrium and right b. the left and right chambers are separated by muscle known as septum so that oxygenated blood does not combine with deoxygenated blood. c. Characteristics of the atrium and ventricle; i. the ventricle has a larger volume of space than the atrium. ii. The ventricle has a thicker wall than the atrium. iii. The left ventricle is thicker and more muscular than the right ventricle because this chamber pumps blood under higher pressure to the entire body. Draw figure 2.3 page 18 d. Each ventricle and atrium is linked to one big blood vessel: i. the left atrium is joined to the pulmonary vein ii. the right atrium is joined to the vena cava iii. the left ventricle is joined to the aorta iv. the right ventricle is joined to the pulmonary artery. The one way flow of blood in the heart is controlled by three types of valves. i. bicuspid valve (or mitra valve) controls the one way blood flow from the left atrium to the left ventricle. ii. The tricuspid valve controls the one way blood flow from the right atrium to the right ventricle. iii. The semilunar valve controls the one way blood flow from the left ventricle to the aorta as well as from the right ventricle to the pulmonary artery.

e.

Science Form 3 note

SMART STUDY - GOOD LUCK

Teacher zaidi@maher2010

B. FUNCTIONS OF THE HEART http://www.cct.um.edu.mt/1997/planet-science/heart/two.htm http://www.encyclopedia.com/html/section/heart_anatomyandfunction.asp http://www.becomehealthynow.com/article/bodycardioheart/687 1. The heart functions as strong muscular pump to: a. collect deoxygenated blood (lacking oxygen) from the rest of the body. Then, this blood is pumped from the heart to the lungs to enriched with oxygen. b. Collect oxygenated blood (enriched with oxygen) from the lungs. Then this blood is pumped out of the heart to be transported throughout the body. the heart also plays a role in the human circulatory system to: a. transport nutrients and oxygen to the body b. transport excretory products such as carbon dioxide, urea and water from the body cells to be removed from the body. PMR 04, 05

2.

C. BLOOD VESSEL IN HUMANS 1. 2.

http://academic.pg.cc.md.us/~aimholtz/AandP/206_ONLINE/BloodFlow/bloodflow1.html

blood vessels are tubes in the body that channel blood. There are three types of blood vessel in the human body,

i.

Artery
• • •

(Pulmonary artery + aorta)

Arteries transport blood from the heart to the body. Arteries have thick, muscled wall which are elastic to withstand the high blood pressure inside. The aorta is the largest artery. Its transport blood out of the heart. The aorta branches to form arteries....
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