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bio 131 > Chapter 18 Heart > Flashcards

Chapter 18 Heart Flashcards

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Biology 101 flashcards
1
Q

How big is the Human Heart

A

12 cm long 9 wide 6 thick

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2
Q

How much does an adult heart weigh

A

300 grams

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3
Q

What is the pericardium

A

Three layered covering that surrounds and protects the heart

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4
Q

What are the 3 layers of the pericardium

A

Fibrous peridcardium
2 layer deep serous pericadium made up of
partial pericardium
visceral pericardium

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5
Q

Describe the Fibrous Pericardium (structure & function)

A

Outermost layer, dense connective tissue anchors heart in mediastinum

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6
Q

Describe the Partial Pericardium

A

Outer most serous layer under the Fibrous Pericardium

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7
Q

Describe the Visceral Pericardium

A

Linner most serous layer that lines the surface heart

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8
Q

What are the 3 layers of the Pericardium seperated by ?

A

pericarial cavity which reduces friction

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9
Q

What are the 3 functions of the Pericardium

A

Protects and anchors the heart
Prevents overfilling of the heart with blood
Allows heart to work in friction free enviroment

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10
Q

How many layers does the heart wall consist of

A
  1. Epicardium-outer layer
  2. Myocardium-cariac muscle, making up bulk of the heart
  3. Ecardium- endotheial layer of the inner myocardium surface
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11
Q

What are sulchi

A

Grooves on the surface of the heart

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12
Q

Which vessles return blood to the heart

A

Superior and anterior Ventae Cavae

Right and left Pulmonary Veins

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13
Q

Which vessels take blood away from the heart

A

Pulmonary Truck

Ascending Aorta

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14
Q

What is the purpose of the Atria

A

Recieving chamber in the heart

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15
Q

How does blood enter the right Atria

A

3 veins
Superior Venae Cavae
Inferior Venae Cavae
Coranory Sinus

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16
Q

How does blood enter the Left Atria

A

4 pulmonary Veins

17
Q

What is the purpose of Ventricles

A

They are the discharging chamber of the heart

18
Q

Where does the right Ventricle pump blood

A

To the pulmonary truck

19
Q

Where does the left Ventricle pump blood

A

to the aorta

20
Q

What do heart valves do?

A

Ensure unidirection blood flow through the heart

21
Q

Where is the Atrioventricular Valve found

A

between the atria and ventricles

22
Q

What is the purpose of the AV valve

A

Prevent backflow into the atria when ventricles contract

23
Q

What is the purpose of the semiludar valve

A

Prevents backflow of blood into the ventricles

24
Q

describe the cardiac muscle

A

one or two nuclei, striated and branched

25
Q

How is the heart muscle simulated

A

Simulated by nerves and self excitable

26
Q

How does the heart contract

A

The heart contracts either as a unit or not at all

all or nothing

27
Q

What are the 3 phases for an action potental in the heart

A

Depolarization
Platuea
Repolarization

bio 131 (7 decks)

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