Blood & Circulatory System Flashcards
Periods of the Heart Cycle
Systole- When the cardiac muscle is contracting
Diastole- When the cardiac muscle is not contracting
How can you tell if the ventricles are contracting
Volumes are reduced
Semi-lunar valves open
Blood is flowing into arteries
Location of sinoatrial(SA) in the heart
Wall of the right Atrium
In which circuit does____:
-The right ventricle pump blood
-The left ventricle pump blood
Right - Pulmonary
Left - Systemic
What causes the sounds of the heartbeat
Bicuspid & Tricuspid Valves closing
Semilunar valves closing
Function of:
1. The coronary/cardiac artery
2. Sinoatrial node
3. Atrioventricular node
- To supply the heart muscle or tissue cells with
blood - Causes the heart to contract
- Causes the Atria to contract
Effect of _____ on the circulatory system:
-Smoking
-Exercise
-Smoking: Increase Heart rate or blood pressure
-Exercise: Increase heart rate or strengthens heart muscle
Closed system
+ advantages
Blood remains enclosed in blood vessels
i.e Human Circulatory system
adv: More efficient
Blood can be pumped faster
A. Organs supplied by systemic
circulatory system.
B. Arteries in the systemic system
A. Heart
Lungs
Kidney
Liver
B. Aorta
Renal artery
Coronary artery
How does blood move through the veins
The muscles contracting moves the blood and the valves prevent backflow
Describe a heartbeat
- Atria relaxed & blood enters
- Bicuspid and Tricuspid valves open allowing
blood flow into ventricles - Ventricles contract
- Bi and Tri valves close
- Ventricles relax
Blood vessel with capillaries at both ends
Hepatic portal vein
What is blood pressure
The force exerted by the blood/heart against the wall of an artery
Artery structural features
Thick walls/muscle to allow it to stretch
Collagen to prevent overexpansion
Dietary changes that benefit the circulatory system
- Less salt to lower blood pressure
- Eat less fat to prevent blockages in arteries
- Drink less alcohol to prevent blood pressure
increase
