respiratory system
Name the main parts of the human respiratory system.
Nose and nasal cavity
Trachea
Bronchi
Bronchioles
Alveoli
Lungs
Diaphragm
What is the main function of red blood cells?
to transport oxygen from the lungs to body cells.
Describe what happens during inhalation.
Answer:
The diaphragm contracts and flattens.
The external intercostal muscles contract.
The ribs move upwards and outwards.
The volume of the chest cavity increases.
Pressure inside the lungs decreases below atmospheric pressure.
What is the function of the trachea?
It carries air from the nose and mouth to the bronchi. It contains cartilage rings that prevent it from collapsing.
Which substance in red blood cells carries oxygen?
Answer: Haemoglobin.
4. What is the difference between inhalation and exhalation? .
Inhalation involves air entering the lungs as chest volume increases and pressure decreases. Exhalation involves air leaving the lungs as chest volume decreases and pressure increases.
What are the functions of the bronchi and bronchioles?
The bronchi carry air into the lungs, while the bronchioles distribute air to the alveoli.
What is the function of white blood cells?
Answer: To defend the body against pathogens and infections.
Why does breathing rate increase during exercise?
Muscles need more energy during exercise, increasing their demand for oxygen and production of carbon dioxide. Breathing rate increases to supply more oxygen and remove excess carbon dioxide.
Why do humans have two lungs?
The lungs provide a large surface area for gas exchange, allowing the body to obtain oxygen and remove carbon dioxide efficiently.
What is plasma?
Plasma is the liquid part of blood that transports blood cells and dissolved substances around the body.
6. State two differences between inhaled and exhaled air.
Inhaled air contains more oxygen than exhaled air.
Exhaled air contains more carbon dioxide and is usually more humid than inhaled air.
What are the products of anaerobic respiration in human muscles?
Lactic acid (lactate) and energy.
Trivia Question: How many "Harry Potter" movies are there?
8
What is the role of the diaphragm in breathing?
The diaphragm changes the volume of the chest cavity. It contracts and flattens during inhalation and relaxes during normal exhalation.