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Have thicker walls than atria's

Nervous system

Detects when blood turns slightly more acidic because of rising CO2 levels (H+), after detection, it sends the order to exhale to make acidity normal again.

Skeletal system

Ribs that protect the lungs and heart

Muscular system (helps in the contraction and expansion of the thoracic cavity)

Intercostal muscles

Abdominal muscles

Diapragm

Review

Respiratory System

Primary bronchi

Secondary bronchi

Tertiary bronchi

Bronchioles

Respiratory bronchioles

Alveolar ducts

Alveolar sacs

Alveoli

Trachea

Has protective cartilage rings

Larynx

Pharynx

Oral/Nasal cavity

Lungs

Left lung

Cardiac notch to fit the heart

2 lobes (sections)

Right lung

Slightly bigger than the left lung

3 lobes (sections)

Expells carbon dioxide

Oxygenate blood

Carries out Gas Exchange

Circulatory System

Heart

Cardiac Cycle

Vena cava → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Pulmonary artery → Lungs (blood leaves the CO2 and gets oxygenated) → Pulmonary vein → Left atrium → Mitral/Bicuspid valve → Left ventricle → Aortic valve → Aorta → Body → Repeat

Valves

Aortic Valve

Mitral (Bicuspid) Valve

Pulmonary

Tricuspid

Left side

Left ventricle

Left atrium

Righ side

Right ventricle

Right atrium

Capillaries

Small branchings

Arteries

Coronary Arteries

Deliver oxygen to the heart

Pulmonary artery

Move oxygenated blood

Veins

Coronary veins

Vena cava

Superior

Blood from the lower part of the body

Inferior

Blood from the top part of the body

Pulmonary vein

Deoxygenated blood

Pumps blood to the body