BIOLOGY KSSM FORM 4: 10.3. MECHANISM OF HEARTBEAT
Автор: Teacher Tasha
Загружено: 2020-08-13
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BIOLOGY KSSM FORM 4 :
CHAPTER 10: TRANSPORT IN HUMANS AND ANIMALS
10.3. MECHANISM OF HEARTBEAT
ANSWERS FOR FORMATIVE PRACTICE 10.3:
1. Sinoatrial node
2. Myogenic means the heart contracts and relaxes without receiving any impulse signal from the nervous system.
3. The blood flow back to the heart requires the contraction of skeletal muscles around the veins. If someone stands on his/her feet for too long, less oxygen flows to the brain, hence less oxygen and glucose are transported to the brain. This causes the individual to pass out.
4. When the blood flow is obstructed from flowing to the fingertips or when the blood vessels contract due to coldness.
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