Respiration And Circulation Mcqs,

1MCQ: The ribs moves upwards and outwards when we
A. inhale
B. exhale
C. digestion
D. defecate
Answer A
2MCQ: More than half of total blood volume is the
A. red and blood cells
B. plasma
C. platelets
D. all of them
Answer B
3MCQ: The special organ in mammals, birds and reptiles is
A. lungs
B. air sacs
C. stomata
D. spiracles
Answer A
4MCQ: Platelets help in blood
A. producing
B. rejuvenating
C. clotting
D. purifying
Answer C
5MCQ: The circulatory system of human is composed of
A. heart
B. blood
C. blood vessels
D. all of them
Answer D
6MCQ: Ventricles are chambers of heart which are
A. upper
B. lower
C. middle
D. valves
Answer B
7MCQ: There is surrounding of rich capillaries around
A. trachea
B. alveoli
C. nostril
D. bronchi
Answer B
8MCQ: A pale yellow liquid in which blood cells n platelets are suspended is
A. plasma
B. fluid
C. cytoplasm
D. liquid
Answer A
9MCQ: The smaller sub divisions of arteries in many tiny blood vessels are called
A. plasma
B. veins
C. valves
D. capillaries
Answer D
10MCQ: The de-oxygenated blood from parts of body is received by
A. right side
B. left side
C. atrium
D. ventricle
Answer A
11MCQ: The larger blood vessels which carry blood back to heart are
A. arteries
B. veins
C. valves
D. capillaries
Answer B
12MCQ: Insects breath through small holes in their body called
A. lungs
B. air sacs
C. stomata
D. spiracles
Answer D
13MCQ: The external part of nose through which air enters is called
A. trachea
B. alveoli
C. nostril
D. bronchi
Answer C
14MCQ: The air which we breath in is called
A. inhaled air
B. exhaled air
C. circulated air
D. deoxygenated air
Answer A
15MCQ: The blood is mixture of
A. red and blood cells
B. plasma
C. platelets
D. all of them
Answer D
16MCQ: The blood vessels which carry blood away from heart to body parts are called
A. arteries
B. veins
C. valves
D. capillaries
Answer A
17MCQ: Bronchioles are further sub division of
A. trachea
B. alveoli
C. nostril
D. bronchi
Answer D
18MCQ: The muscular organ which pushes blood to all parts of body is called
A. heart
B. blood
C. blood vessels
D. liver
Answer A
19MCQ: The organism which carry out both aerobic and anaerobic respiration is
A. plants
B. cow
C. deer
D. yeast
Answer D
20MCQ: The size of heart is about the size of
A. clenched fist
B. palm
C. small finger
D. foot
Answer A
21MCQ: Human beings have specialized structure to carry out exchange of gases called
A. respiratory system
B. digestion system
C. nervous system
D. circulatory system
Answer A
22MCQ: The blood which is oxygenated in lungs is carried to heart by
A. pulmonary veins
B. carotid veins
C. aorta
D. jugular vein
Answer A
23MCQ: Blood collects oxygen from inhaled air and gives off carbon dioxide in the
A. lungs
B. liver
C. kidneys
D. heart
Answer A

24MCQ: Respiration which takes place in the absence of oxygen is called
A. cellular respiration
B. aerobic respiration
C. anaerobic respiration
D. breathing
Answer C
25MCQ: There is higher concentration of oxygen in
A. inhaled air
B. exhaled air
C. circulated air
D. deoxygenated air
Answer A
26MCQ: The distance which is travelled by an average red blood cell is equal to
A. 1500km
B. 1200km
C. 2100km
D. 5100km
Answer A
27MCQ: Heart is made of specialized
A. cardiac muscles
B. connective tissues
C. both a and b
D. skeletal sphincters
AnswerC
28MCQ: The composition of red blood cells have specialized protein called
A. iron
B. chlorophyll
C. copper
D. silver
Answer A
29MCQ: The transport system of blood by special organ heart constitutes
A. circulatory system
B. respiratory system
C. digestion system
D. nervous system
Answer A
30MCQ: The life span of red blood cells is
A. 2 months
B. 45 days
C. 4 months
D. 12 days
Answer C
31MCQ: Exhaled air is the air which we
A. breath in
B. breath out
C. transport in body
D. use under water
Answer B
32MCQ: The division of windpipe is done in two
A. bronchioles
B. alveoli
C. nostril
D. bronchi
Answer D
33MCQ: The small air sacs which are present at the end are called
A. trachea
B. alveoli
C. nostril
D. bronchi
Answer B
34MCQ: The number of chambers in a heart is
A. 2
B. 3
C. 4
D. 1
Answer C
35MCQ: A long wind pipe in which air enters when we breath is called
A. trachea
B. alveoli
C. nostril
D. bronchi
Answer A
36MCQ: The upper small chambers are called as
A. atria
B. ventricle
C. systole
D. diastole
Answer A
37MCQ: The protein which is red in color and present in blood is called
A. hemoglobin
B. red cells
C. platelets
D. iron cells
Answer A
38MCQ: Capillaries are
A. thin
B. transfer oxygen
C. transfer digested food
D. all of them
Answer D
39MCQ: The process by which glucose reacts with oxygen in cells in order to release energy gradually is called
A. cellular respiration
B. aerobic respiration
C. anaerobic respiration
D. breathing
Answer B
40MCQ: The process by which energy is released from glucose or other food molecules in the cell of living organisms is called
A. respiration
B. transpiration
C. digestion
D. defecation
AnswerA
41MCQ: The function of white blood cells is to provide
A. support
B. immunity
C. nutrients
D. transport gases
Answer B
42MCQ: A sheet of muscles which contracts or flatten when we breath is called
A. diaphragm
B. ribs
C. lungs
D. stomach
Answer A
443MCQ: When atria contracts, ventricles
A. relax
B. also contract
C. squeeze
D. block
Answer A
44MCQ: The function of the valves is to
A. transfer the blood from atria to ventricles
B. stop the backflow of blood
C. help chambers to contract
D. help chambers to relax
Answer B
45MCQ: The muscles of the atria and ventricles squeeze to
A. move the blood
B. make some space for blood
C. make space for air
D. build a vacuum
Answer A
46MCQ: When ventricles contract, atria
A. relaxes
B. also contracts
C. squeezes
D. blocks
Answer A