Question: 1 what is the importance of the valves of the...
1. What is the importance of the valves of the heart?
- regulation of heart rate
- coordination of the contraction of ventricles
- allow blood to enter the heart from the arteries
- prevent backflow of blood from ventricles to atria
2. Why is blood pressure lower during diastole than during systole?
- More blood flows into the heart during systole than during diastole
- The contraction of the heart during systole increases the blood pressure against arterial walls.
- The contraction of the heart during diastole decreases the blood pressure against arterial walls.
- The contraction of the heart during systole increases the blood pressure against the valves separating the atria from the ventricles.
- The relaxation of the heart during diastole decreases the blood pressure against arterial walls.
3. Atherosclerosis can be caused by_____________?
- the blood vessels becoming to elastic
- the release of stress hormones such as epinephrine
- chronic hypertension
- a lack of calcium in the diet
4. If you become dehydrated, and your blood pressure drops. How will the kidneys respond?
- by producing a large amount of urine
- by returning more water to the blood stream and producing less urine
- by shutting down.
- by moving fluid from the urinary bladder back into the blood stream.
5. What is the site of gas exchange within the lungs?
6. What would help destroy pathogens on food you eat?
- digestive enzymes
- the oil secreted onto your skin
- stomach acid
7. What led to the 2008 San Diego and 2015 measles outbreaks at Disneyland?
- poor hand washing by food workers
- California's measles vaccination rates had fallen bellow levels required for heard immunity.
- the MMR vaccine is no longer effective.
- over-use of antibiotics.