Breathing and Respiration Year 8 Flashcards
State the route that air takes to get into the lungs
nose/mouth trachea bronchus bronchiole alveoli
Describe gas exchange in the alveoli
oxygen diffusing into the blood stream and carbon dioxide diffusing into the alveoli
Characteristics of the alveoli
grape like moist large surface area thin permeable walls
breathing in …
intercostal muscles contract lifting ribs upwards and outwards diaphram contracts(flattens) air pressure within chest is less than air pressure outside
breathing out…
intercostal muscles relax moving ribs down and inwards diaphram relaxes (dome shaped) air pressure within chest is more than air pressure outside
tobacco smoke contains
tar carbon monoxide and nicotine
tar contains…
cancer- producing substances which canproduce lung cancer which damages the cillia
carbon monoxide…
reduces the oxygfen carrying capacity of the blood because haemoglobin has a high affinity for carbon monoxide than oxygen
nicotine is a ….
addictive drug
respiration is…
the breakdown of glucose to release oxygen and occurs in all living cells
