Exam 9

Question 1

In cardiac muscle, the movement of action potentials along the plasma membrane causes ___-gated channels along the ______ to open

Answer 1

Volatage, transverse tubules

Question 2

Increasing the end diastolic volume a little will ___ the stroke volume while the ______ will remain the same.

Answer 2

increase, heart rate

Question 3

Which is the correct sequence of flow through a normal heart?

Answer 3

Pulmonary vein—-L atrium—biscuspid valve—-left ventricle—semilunar valve–aorta—-body tissues—vena cava—R atrium—tricuspid valve —-R ventricle —pulmonary artery—lungs

Question 4

Without the cardiovascular system to provide _____, we would more likely look like a ______

Answer 4

convection, large flat kite

Question 5

While birds use their metabolism to maintain their body temperature, fish do not. Therefore, the appropriate expectation for each animal’s heart rate change when moving from a comfortable to a very cold environment would be

Answer 5

Fish unchanged, bird increased

Question 6

ESV is the amount of blood left in the heart after _______, it is the ____ of blood, it is _____ than EDV, it is a component in determining the stroke volume

Answer 6

After ventricular contraction, minimum ventricular volume, always smaller

Question 7

A patient’s blood work shows that her potassium levels are very low. As a result, her heart rate will be ____ because the potassium is intimately involved in the creation of ____ in the heart

Answer 7

Decreased, action potentials

Question 8

Atrial cells contract because of ___ signals passed via _____

Answer 8

electrical, gap junctions

Question 9

To ___ heart rate, our body must ___ parasympathetic actions at the ___- node

Answer 9

decrease, increase,SA

Question 10

Herky the Hawk was diagnosed with Sick Sinus Syndrome, a heart dysfunction that can cause too fast or too slow a heart rate. It is believed that the whole heart is receving irregular electrical impulses. From these details, Brutus correctly told Carmen that the area linked to this dysfunction is the _____

Answer 10

Sinoatrial node

Question 11

Which of the following endocrines will negatively impact human growth when released?

Answer 11

Cortisol

Question 12

After viewing the EKG, a doctor tells her patient that she believes that there is an electrical block in his atrial cells and they are not depolarizing properly. Therefore, the doctor viewed an irregularity with the ____

Answer 12

P wave

Question 13

After the QRS, the heart contains its _______ volume, under sympathetic control, the time the heart spends in the diastolic phase will ____, and cardiac output and heart rate have a ______

Answer 13

Smallest, decrease, direct relationship

Question 14

The ___ is the smallest chamber of the heart because this chamber needs to move blood _____

Answer 14

Right atrium, the shortest distance

Question 15

Let us assume that the cost of GH and IGF-1 is the same per endocrine injected. In that case, a person wanting a quick method for building muscle should purchase ______

Answer 15

GH because of the benefits of amplification and it can impact the muscles without IGF-1

Question 16

When she is around and playing, her cardiac output ______ because her heart rate or stroke volume _____, her end diastolic volume _____, and the action potential velocity ______

Answer 16

increases, has increased, increases, might not have increased

Question 17

The Bundles of His carry the electrical signal towards the ________, the electrical signal travels immediately from the _____ to the Bundles of His, and the ______ separates blood going to the lungs from blood going to the knees

Answer 17

Lowest point in the heart, AV node, interventricular septum

Question 18

Removing the parathyroid gland from an otherwise normal individual would cause _____ to be excreted by the kidneys, the ability of the heart to contract would be _____, and the bones would likely ______

Answer 18

Too much calcium, decreased, likely not become weakened