Question 1

A(n) ________ is a recording of the electrical activities of the heart.

Accepted Answer

The answer of A(n) ________ is a recording of the...

Question 2

The cardiovascular system consists of the ________ and ________.

Accepted Answer

The answer of The cardiovascular system consists of the ________...

Question 3

If the connective tissue in the ventricles, called ________, gives way, blood may go backward through the AV valves.

Accepted Answer

The answer of If the connective tissue in the ventricles,...

Question 4

Which of these is the most correct sequence of signals?

Accepted Answer

The correct sequence of electrical conduction in the heart is SA node (sinoatrial node) > AV node (atrioventricular node) > AV bundle (bundle of His) > Purkinje fibers > walls of the ventricle. Therefore, option D is the most correct sequence. Option A is incorrect as it reverses the order of the AV node and AV bundle. Option B is incorrect as the ST segment refers to a portion of the ECG (electrocardiogram) and is not part of the conduction system. Option C is also incorrect as it omits the Purkinje fibers.

Question 5

Cardiac muscle cells connect to each other at special junctions called ________ disks.

Accepted Answer

The answer of Cardiac muscle cells connect to each other...

Question 6

The tempo of the heartbeat is set by a cluster of specialized cardiac muscle cells called the ________.

Accepted Answer

The answer of The tempo of the heartbeat is set...

Question 7

A physician has a patient with an abnormal heart sound. After running some tests, the doctor decides that the patient has a heart murmur, but the condition is not severe enough to warrant open-heart surgery. Which of the following would lead the doctor to make this determination?

Accepted Answer

A heart murmur is an abnormal sound heard during a heartbeat, and it can be caused by a variety of factors. In this case, the doctor has determined that the heart murmur is not severe enough to warrant open-heart surgery. A possible reason for this determination is that the amount of blood flowing backward in the heart is not enough to strain the heart as it works harder to catch up. This indicates that the heart is still able to function effectively despite the heart murmur.

Question 8

A(n) ________ is the device that is used to measure blood pressure.

Accepted Answer

The answer of A(n) ________ is the device that is...

Question 9

The lowest blood pressure that occurs when the ventricles are relaxing is known as ________.

Accepted Answer

Diastolic pressure is the lowest blood pressure that occurs when the ventricles of the heart are relaxed, while systolic pressure is the highest pressure that occurs when the ventricles contract. Aneurysm refers to a bulging and weakened area in an artery, while arterial pressure refers to the pressure within the arteries.

Question 10

Because the sinoatrial node sends out impulses that initiate each heartbeat, it is often referred to as the ________ of the heart.

Accepted Answer

The answer of Because the sinoatrial node sends out impulses...

Question 11

The ________ is a fibrous sac that holds the heart in the center of the chest cavity without hampering its movements, even when the heart is contracting vigorously.

Accepted Answer

The answer of The ________ is a fibrous sac that...

Question 12

Heart block is a condition in which the SA node is properly functioning but the atria and ventricles are contracting out of synch. Which of the following statements explains why this happens?

Accepted Answer

In heart block, the problem lies in the AV node, which is responsible for transmitting electrical signals from the atria to the ventricles. When the AV node is not sending signals properly or at all, the atria and ventricles will contract out of synch, causing heart block. Option A is incorrect because the SA node is working properly in this condition. Option C is incorrect because inadequate blood flow to the heart can cause heart attack or angina, but not heart block. Option D is incorrect because backflow of blood through the heart valves is known as valvular insufficiency and would not cause heart block.

Question 13

In a surgery of a few hours, the skeletal muscles are normally immobilized. Using the knowledge of this chapter, which of the following conditions would most likely result normally if countermeasures were not taken?

Accepted Answer

When skeletal muscles are immobilized for a few hours, the lack of muscle contractions can result in reduced fluid movement through the lymph vessels, leading to fluid buildup in the tissues (edema). Countermeasures such as compression stockings or regular movements can help prevent this condition. Excessive redness of the skin, excessive sweating, and rapid breathing are not directly related to immobilization of skeletal muscles.

Question 14

The ________ valves prevent blood from flowing back into the heart once it has left the ventricles.

Accepted Answer

The answer of The ________ valves prevent blood from flowing...

Question 15

Jorge has developed prostate cancer, so he undergoes an operation to remove the malignancy. What other structures will the cancer specialists look at to check for metastasis?

Accepted Answer

Cancer specialists commonly check neighboring lymph nodes to see if the cancer has spread beyond the prostate. This helps them determine if additional treatment, such as chemotherapy or radiation, is necessary. While metastasis could potentially occur in other structures listed, checking neighboring lymph nodes would be the most relevant in this case.

Question 16

Which of these is the portion of the heartbeat that involves contraction of the heart?

Accepted Answer

Systole refers to the period of the heartbeat during which the heart muscle contracts, pushing blood out of the chambers and into the circulation.

Question 17

The left side of the heart and the arteries and veins in the body tissues make up the ________ circuit.

Accepted Answer

The answer of The left side of the heart and...

Question 18

A heart ________ can be heard with a stethoscope and is an indication to a physician of disturbed blood flow due to a damaged heart valve.

Accepted Answer

The answer of A heart ________ can be heard with...

Question 19

In an EKG, what does the QRS wave indicate?

Accepted Answer

The QRS wave indicates the electrical signal over the ventricles.

Question 20

The smallest arteries, called ________, are barely visible to the unaided eye.

Accepted Answer

The answer of The smallest arteries, called ________, are barely...

Quiz 15: The Cardiovascular and Lymphatic Systems