Can anybody help me with answers for these? I am having a hard time. Sorry about

Question

Can anybody help me with answers for these? I am having a hard time. Sorry about the weird formatting.

1. The heart rate can be determined from the R-R interval

a. True
b. False

2. Because coronary arteries are expanded for blood flow only when the heart is relaxed, strenuous exercise could increase the chance of a heart attack.

a. True

b. False

3. The lungs and walls of the thoracic cavity

a. are directly connected to one another

b. are connected by the pleura

c. are connected by the pericardium

d. are not connected to one another

4. Blood travels from the heart through arteries, capillaries, and to the veins. During this journey the blood pressure

increases

decreases

remains about the same

5. The human heart is located

in the thoracic cavity

in the abdominal cavity

in both the thoracic and abdominal cavity

5. When the diaphram contracts, the volume of the chest cavity

increases

decreases

5. When the diaphram contacts, the pressure in the alveoli __________ and air flows _________.

increases, out

increases, in

decreases, out

decreases, in

6. When the pressure inside the lungs decreases, the pulse curve _________ which indicates the stroke volume __________.

a. rose, increased

b. rose, decreased

c. fell, decreased

d. fell, increased

7. After the change in the stroke volume, the heart rate

increased

decreased

8. During inhalation, the pressure increase in the abdominal cavity increases stroke volume of the heart.

True

False

a. True

b. False

Explanation / Answer

1 answer will be a) True ..

2 answer will be a) true but under certain conditions..if the patient is suffering from CAD( Coronary artery disease) have more chance..

3 answer will be B) are connected by pleura

4 answer will be a) increase

5(a) a) in thoracic cavity

5 answer will be a) increase

It is because the diaphragm is dome shaped..if it contracts it becomes flatten..so volume of thoracic cavity increase..

5 (b) answer will be D) decreases, in

6 answer will be a) rose , increase.

If lung pressure decrease there will be increased venous return.

7 answer will be heart rate also change..

8 answer will be B false ..

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