Week 7

Question 1

Where is your heart?

Answer 1

• Inferior mediastinum medial cavity of thorax
• Rests on the diaphragm
• Apex points to left hip.

Question 2

How big is your heart.

Answer 2

• Size of your fist.

Question 3

What does your heart do?

Answer 3

Pumps blood to
1. Lungs for oxygenation (O2) + CO2 loss (RV)
2. Body for transportation of gases, wastes, electrolytes, nutrients, hormones ect. (LV)

Question 4

Why does not heart need its own blood supply when there is blood passing through it?

Answer 4

Cannot receive O2 and glucose from blood passing through its chambers.

Question 5

Term - Aorta

Answer 5

Blood moves OUT of the left ventricle into this structure.

Question 6

Term - Pulmonary trunk

Answer 6

Blood leaves the right ventricles and flows INTO this structure.

Question 7

Term - Tricspid Valve

Answer 7

Blood from the right atrium flows THROUGH this structure.

Question 8

Term - Right atrium

Answer 8

Location of the heart’s pacemaker (SA node).

Question 9

Term - Left atrium

Answer 9

Blood moves INTO this structure once fully oxygenated by lungs.

Question 10

Term - Mitral valve

Answer 10

Blood from the left atrium flows THROUGH this structure.

Question 11

Name the two components of the cardiac output?

Answer 11

Heart rate (HR) x Stroke volume (SV)

Question 12

What are some things that can influence stroke volume and heart rate?

Answer 12

• Heart rate – temperature, nerves, hormones, medications.
• Stroke volume – venous return volume, filling time contractility of myocardium.