Melissatonogidn
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Guide Questions: 1. 2. After reading the handout about the heart and blood circulation, answer the fol- lowing questions. What are the two circuits by which the gases are circulated in and out of the lungs? What tissues in the body transport the nutrients, gases and other substances in the human body? 3. Describe the transport of gases in a pulmonary circuit. 4. Describe the transport of gases in a systemic circuit. 5. Describe the exchange of gases in a pulmonary capillaries.​

Guide Questions 1 2 After Reading The Handout About The Heart And Blood Circulation Answer The Fol Lowing Questions What Are The Two Circuits By Which The Gases class=

Sagot :

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Answer:

1.The first phase is called systole (SISS-tuh-lee). This is when the ventricles contract and pump blood into the aorta and pulmonary artery. During systole, the atrioventricular valves close, creating the first sound (the lub) of a heartbeat. When the atrioventricular valves close, it keeps the blood from going back up into the atria. During this time, the aortic and pulmonary valves are open to allow blood into the aorta and pulmonary artery. When the ventricles finish contracting, the aortic and pulmonary valves close to prevent blood from flowing back into the ventricles. These valves closing is what creates the second sound (the dub) of a heartbeat.

2.The second phase is called diastole (die-AS-tuh-lee). This is when the atrioventricular valves open and the ventricles relax. This allows the ventricles to fill with blood from the atria, and get ready for the next heartbeat.

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