Sciences - Co-ordinated (Double) - 0654 CIE

Heart

Gbogbo ọrọ náà

Your heart beats about 70 times a minute, every minute, for your whole life, pushing blood to every organ in your body. It is a muscular pump with four chambers and a set of one-way valves that keep blood flowing in the right direction. Understanding it explains everything from your pulse to the leading cause of death worldwide.

In this lesson you will learn the structure of the mammalian heart, how it is monitored, and what coronary heart disease is. Extended students will explain why the heart's walls differ in thickness, how the valves work in sequence, and why exercise speeds the heart up.

Ebumnobi

Identify in diagrams and images the structures of the mammalian heart, limited to: muscular wall, septum, left and right ventricles, left and right atria, one-way valves and coronary arteries
State that blood is pumped away from the heart in arteries and returns to the heart in veins
State that the activity of the heart may be monitored by: ECG, pulse rate and listening to sounds of valves closing
Investigate and describe the effect of physical activity on the heart rate
Describe coronary heart disease in terms of the blockage of coronary arteries and state the possible risk factors including: diet, lack of exercise, stress, smoking, genetic predisposition, age and sex
Discuss the roles of diet and exercise in reducing the risk of coronary heart disease
[Supplement] Identify in diagrams and images the atrioventricular and semilunar valves in the mammalian heart
[Supplement] Explain the relative thickness of: (a) the muscle walls of the left and right ventricles (b) the muscle walls of the atria compared to those of the ventricles
[Supplement] Explain the importance of the septum in separating oxygenated and deoxygenated blood
[Supplement] Describe the functioning of the heart in terms of the contraction of muscles of the atria and ventricles and the action of the valves
[Supplement] Explain the effect of physical activity on the heart rate

Akọmọ Ojú-ẹkọ

The heart is the engine of the whole circulatory system, and coronary heart disease is one of the biggest killers in the world. This topic blends pure structure (labelling chambers and valves) with applied biology (diet, exercise and risk), so it rewards both careful recall and clear reasoning.

Ọ dị na ngwa Green Bridge

Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Heart. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

The thick-walled chambers that pump blood out of the heart are the: A. atria B. ventricles C. valves D. veins Answer: B
The wall of muscle separating the left and right sides of the heart is the: A. septum B. aorta C. valve D. atrium Answer: A
[Supplement] The valves found in the aorta and pulmonary artery are the: A. atrioventricular valves B. semilunar valves C. coronary valves D. venous valves Answer: B
Which is a risk factor for coronary heart disease that cannot be controlled? A. smoking B. diet C. lack of exercise D. age Answer: D
The heart muscle itself is supplied with blood by the: A. pulmonary vein B. coronary arteries C. vena cava D. semilunar valves Answer: B