$CATEGORY: Science - Khan Academy/6.Life Processes/6.Life Processes--Transportation

//Multiple Choice

Which type of blood vessel carries blood away from the heart? {
    =Arteries
    ~Veins
    ~Capillaries
    ~Lymph vessels
}

Which blood vessels have valves to prevent backflow of blood? {
    ~Arteries
    =Veins
    ~Capillaries
    ~Arterioles
}

What is the main characteristic of arterial walls? {
    ~Thin and elastic
    =Thick and muscular
    ~Thin and non-elastic
    ~Thick and rigid
}

Veins carry blood at a _______ pressure compared to arteries. {
    ~Higher
    =Lower
    ~Equal
    ~Variable
}

Which blood vessel has the smallest lumen? {
    =Capillaries
    ~Arteries
    ~Veins
    ~Arterioles
}

What type of blood do veins generally carry? {
    ~Oxygenated blood
    =Deoxygenated blood
    ~Both oxygenated and deoxygenated blood
    ~Plasma only
}

Which of the following arteries carries deoxygenated blood? {
    ~Aorta
    =Pulmonary artery
    ~Coronary artery
    ~Carotid artery
}

Which vein carries oxygenated blood? {
    =Pulmonary vein
    ~Superior vena cava
    ~Inferior vena cava
    ~Coronary vein
}

Which of the following is true about veins? {
    ~They have thick walls.
    ~They carry blood under high pressure.
    =They carry blood towards the heart.
    ~They always carry oxygenated blood.
}

Capillaries connect\: {
    =Arteries and veins
    ~Arteries and lymph vessels
    ~Veins and lymph vessels
    ~Lymph vessels and tissues
}

//True or False

Arteries carry blood away from the heart. {T}

Veins have thicker walls than arteries. {F}

The pulmonary artery carries oxygenated blood. {F}

Valves are present in veins but not in arteries. {T}

Arteries carry blood under low pressure. {F}

Capillaries connect arteries to veins. {T}

The aorta is a vein. {F}

Veins are collapsible due to their thin walls. {T}

The pulmonary vein carries oxygenated blood to the heart. {T}

Blood flows faster in veins than in arteries. {F}

//Fill in the blanks

_______ are blood vessels that carry blood away from the heart. {
    =Arteries
    ~Veins
    ~Capillaries
    ~Lymph vessels
}

Veins have _______ to prevent the backflow of blood. {
    =Valves
    ~Thick walls
    ~Elastic fibers
    ~Muscles
}

Arteries carry blood under _______ pressure. {
    =High
    ~Low
    ~Medium
    ~Variable
}

The _______ artery carries deoxygenated blood to the lungs. {
    =Pulmonary
    ~Coronary
    ~Aorta
    ~Carotid
}

The _______ vein carries oxygenated blood from the lungs to the heart. {
    =Pulmonary
    ~Coronary
    ~Jugular
    ~Vena cava
}

The largest artery in the body is the _______. {
    =Aorta
    ~Pulmonary artery
    ~Coronary artery
    ~Carotid artery
}

Veins carry blood at a _______ pressure compared to arteries. {
    =Lower
    ~Higher
    ~Equal
    ~Variable
}

Capillaries are _______ thick. {
    =One cell
    ~Two cells
    ~Three cells
    ~Four cells
}

_______ connect arteries to veins. {
    =Capillaries
    ~Arterioles
    ~Venules
    ~Lymph vessels
}

The _______ wall of veins makes them collapsible. {
    =Thin
    ~Thick
    ~Elastic
    ~Rigid
}

//Numericals

A person's heart pumps 5 liters of blood per minute. How much blood is pumped in 1 hour? {
    ~200 liters
    =300 liters
    ~400 liters
    ~500 liters
}

Blood flows through an artery at a speed of 0.4 m/s. If the artery is 8 m long, how much time does blood take to travel through it? {
    ~10 seconds
    =20 seconds
    ~15 seconds
    ~12 seconds
}

The stroke volume of the heart is 70 mL, and the heart rate is 80 beats per minute. Calculate the cardiac output. {
    ~4.6 L/min
    =5.6 L/min
    ~6.4 L/min
    ~7.2 L/min
}

If a person’s blood pressure is 120/80 mmHg, what does the "120" represent? {
    =Systolic pressure
    ~Diastolic pressure
    ~Pulse pressure
    ~None of the above
}

Blood flows through a vein at 0.2 m/s. If the vein is 12 m long, how much time will it take for blood to travel? {
    ~30 seconds
    =60 seconds
    ~50 seconds
    ~20 seconds
}

A capillary has a diameter of 8 µm. If a red blood cell is 7 µm, how much space is left? {
    =1 µm
    ~2 µm
    ~0.5 µm
    ~3 µm
}

If blood flows at 1.5 m/s in an artery of length 15 m, how long will it take to travel the length? {
    =10 seconds
    ~15 seconds
    ~12 seconds
    ~8 seconds
}

The heart beats 72 times per minute. How many beats occur in 24 hours? {
    =1,03,680
    ~1,44,000
    ~86,400
    ~72,000
}

A vein carries blood at a rate of 3 liters per minute. How much blood flows in 10 minutes? {
    ~20 liters
    =30 liters
    ~40 liters
    ~50 liters
}

If the pressure in an artery is 120 mmHg and in a vein is 40 mmHg, what is the pressure difference? {
    =80 mmHg
    ~60 mmHg
    ~100 mmHg
    ~40 mmHg
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Arteries -> Carry blood away from the heart 
=Veins -> Carry blood to the heart 
=Capillaries -> Connect arteries and veins 
=Valves -> Prevent backflow of blood 
}


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