Organising animals and plants Flashcards
(24 cards)
What is the primary function of arteries?
To carry oxygenated blood away from the heart to the tissues.
True or False: Veins carry deoxygenated blood back to the heart.
True
What is the main structural feature of arteries that allows them to withstand high pressure?
Thick muscular walls.
Fill in the blank: Capillaries have walls that are _______ to facilitate the exchange of gases and nutrients.
one cell thick
Which type of blood vessel has valves to prevent backflow?
Veins
What is the role of smooth muscle in arteries?
To regulate blood flow and pressure.
What type of blood do pulmonary arteries carry?
Deoxygenated blood
True or False: Capillaries are involved in nutrient and waste exchange.
True
What is the lumen size of veins compared to arteries?
Veins have a larger lumen than arteries.
What adaptation allows capillaries to maximize diffusion?
Their extensive network and thin walls.
Multiple Choice: Which vessel type carries oxygen-rich blood? A) Arteries B) Veins C) Capillaries
A) Arteries
What do we call the smallest blood vessels in the body?
Capillaries
Fill in the blank: The _______ of veins is responsible for helping move blood back to the heart.
valves
What is a key difference between the walls of arteries and veins?
Arteries have thicker walls than veins.
True or False: The blood in veins is always deoxygenated.
False
What type of blood vessel is primarily responsible for nutrient absorption in tissues?
Capillaries
Multiple Choice: Which vessel type has the highest blood pressure? A) Arteries B) Veins C) Capillaries
A) Arteries
Fill in the blank: Veins are often located _______ to the muscles which help pump blood back to the heart.
close
True or False: Arteries can constrict and dilate to regulate blood flow.
True
What type of blood vessel has the lowest blood pressure?
Veins
Multiple Choice: Which type of blood vessel is primarily involved in the exchange of materials? A) Arteries B) Veins C) Capillaries
C) Capillaries
What is the primary role of valves in veins?
To prevent the backflow of blood.
Fill in the blank: The _______ of arteries allows them to stretch and accommodate varying volumes of blood.
elasticity
What type of muscle surrounds the arteries and veins?
Smooth muscle
