How is the embolism of a thrombotic stroke formed? ① Blood flow slows down. ② A sudden change in heart rhythm prevents the upper chambers of the heart from contracting normally. ③ Platelets, clotting factors, and fibrin stick together. ④ The clot can be carried up towards the arteries and blood vessels supplying the brain until it can’t squeeze through.
A: ②④③①
B: ②①③④
C: ②①④③
D: ①②④③
A: ②④③①
B: ②①③④
C: ②①④③
D: ①②④③
举一反三
- Where do the clots come from? Blood flow slow down. A sudden change in heart rhythm leads the upper chambers to contract abnormally. Platelets, clotting factors, and fibrin stick together. The clot can be carried up towards the arteries and blood vessels supplying the brain until getting to one it can't squeeze through. A: ①②③④ B: ②①③④ C: ②③①④ D: ①③④②
- From the fourth paragraph we learn that ______ A: heart attacks are more likely caused by alcohol than stroke B: moderate drinking discourages blood platelets from clotting C: boosting the levels of good cholesterol can lead to heart attacks D: moderate drinking protects people by making the blood cell clump
- If the _______ stops beating, no blood can flow through the body.() A: heart B: lungs
- Which of the blood vessels conduct blood away from the ventricles of the heart and lead to the capillaries? A: arteries and veins B: arterioles and venules C: arteries and venules D: arteries and arterioles
- What can not produce Doppler effect in human body ( ) A: Fetal heart B: Heart valve C: Stationary liver tissue D: Blood flow