Question 1:
Name the main heart pacemaker.
Answer:
Sinoatrial node
Name the main heart pacemaker.
Answer:
Sinoatrial node
Question 2:
What does the term myogenic mean?
Answer:
Myogenic means the heart contracts and relaxes without receiving any impulse signal from the nervous system.
What does the term myogenic mean?
Answer:
Myogenic means the heart contracts and relaxes without receiving any impulse signal from the nervous system.
Question 3:
Explain why a person who stands too long may faint.
Answer:
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.
Explain why a person who stands too long may faint.
Answer:
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.
Question 4:
In what circumstances would fingers turn pale?
Answer:
When the blood flow is obstructed from flowing to the fingertips or when the blood vessels contract due to coldness.
In what circumstances would fingers turn pale?
Answer:
When the blood flow is obstructed from flowing to the fingertips or when the blood vessels contract due to coldness.