A. Stomach
B. Liver
C. Lungs
D. Pancreas
# Bohr's effect is the:
A. Mass movement of the Na+ ions from the axoplasm to the surrounding interstitial fluid
B. Dissociation of oxy-hemoglobin in the blood capillaries due to the effect of CO2 concentration in the body cells
C. Exchange between HCO3 of the RBC and Cl of blood plasma
D. Effect of neurohumors on pacemaker for heart beating
# Eustachian tube connects:
A. Middle ear and pharynx
B. Inner ear and pharynx
C. Middle ear and internal ear
D. External ear and middle ear
# Total number of oxygen molecules that can bind to a single hemoglobin under normal partial pressure is:
A. 2
B. 4
C. 6
D. 8
# The normal volume of air that is expelled or inhaled during normal breathing is:
A. Tidal volume
B. Vital capacity
C. Dead air space
D. ERV
# Pneumotaxic centre related to respiration is located in:
A. Crura cerebri
B. Pons varoli
C. Medulla oblongata
D. Parietal lobe
# Respiratory centers which control inspiration and expiration are located in:
A. Medulla oblongata
B. Hypothalamus
C. Spinal cord
D. Cerebellum
# Hyaline cartilage is found in:
A. Pubic symphysis
B. Pinna
C. Suprascapula
D. Trachea
# When CO2 concentration in blood increases, breathing becomes:
A. faster and deeper
B. shallower and slow
C. no effect on breathing
D. slow and deep
# A unique feature of mammalian body is presence of:
A. four chambered heart
B. diaphragm
C. homeothermic
D. rib cage
# The amount of air which cannot be expelled from the lungs is called:
A. Tidal volume
B. Inspiratory reserve volume
C. residual volume
D. expiratory volume
# People living in high altitude will have:
A. high hemoglobin concentration
B. low hemoglobin concentration
C. normal hemoglobin concentration
D. increased heart rate
# Hemoptysis means:
A. Vomitting of blood
B. Coughing out of blood
C. Blood in the urine
D. Blood in the stool
# Amount of air expelled during normal breathing at rest is referred as:
A. expiratory reserve volume
B. residual volume
C. vital capacity
D. tidal volume
# Total lung capacity is:
A. 4 Liters
B. 5 liters
C. 6 liters
D. 8 liters
# A person dying due to lack of breathing has:
A. Asphyxia
B. Coma
C. Dysphagia
D. Dysphasia
# Carbonic anhydrase enzyme is required for the transportation of:
A. O2
B. CO2
C. Hormones
D. Minerals
# Vital capacity refers to the:
A. Pulmonary function test
B. Capacity of the vital centers of the brain
C. Power of leg muscles
D. Pumping power of the heart
# High altitude sickness is due to:
A. Low O2 concentration
B. High O2 concentration
C. Low CO2 concentration
D. High Co2 concentration
# One of the following muscles is not involved in quiet respiration:
A. Abdominal muscles
B. Diaphragm
C. Sternocleidomastoid
D. Intercostal muscles
# Body temperature is regulated by:
A. Kidneys, lungs, ears
B. Skin, Mouth, nose
C. Skin, mouth, lungs
D. Skin, mouth, ears
# Active respiration includes all EXCEPT:
A. Trachea
B. Diaphragm
C. Thorax
D. Intercostal muscles
# When iron of hemoglobin changes from Fe++to Fe+++ the changed hemoglobin is called:
A. Myoglobin
B. Methemoglobin
C. Carboxyhemoglobin
D. Oxyhemoglobin
# During expiration, abdomen moves inward and diaphragm:
A. Descend downward
B. Recoils upward
C. Becomes flattened
D. Remains stationary
# The normal pressure within the thoracic pleural cavity is:
A. Positive
B. Negative
C. Zero
D. Changes between positive and negative
# Basal metabolic rate depends upon:
A. Body temperature
B. Environment temperature
C. Surface area of the body
D. All of the above
# In adult humans, trachea bifurcates at the level of _______ thoracic vertebra.
A. 5th
B. 6th
C. 7th
D. 8th
# Air is breathed through:
A. Trachea-lungs-larynx-pharynx-alveoli
B. Nose-larynx-pharynx-bronchus-alveoli-bronchioles
C. Nostrils-pharynx-larynx-trachea-bronchi-bronchioles-alveoli
D. Nose-mouth-lungs
# The blood coming out of lungs is richer than that entering into lungs in:
A. CO2
B. O2
C. Both
D. None
# In lungs, air is separated from venous blood by:
A. Squamous epithelium + tunica externa of blood vessel
B. Squamous epithelium + endothelium of blood vessel
C. Transitional epithelium + tunica media of blood vessel
D. Cuboidal epithelium + tunica media
# Respiratory center is situated in:
A. Cerebellum
B. Medulla oblongata
C. Hypothalamus
D. Cerebrum
# Number of RBCs per unit volume of blood is likely to be higher in a person living at high altitudes because:
A. Air is clean and unpolluted
B. More sunshine is available
C. Air is less dense
D. Vegetation gives out more CO2
# Carbonic anhydrase is found in:
A. Leucocytes
B. Lymphocytes
C. Erythrocytes
D. Blood plasma
# If the CO2 concentration in the blood increases, the breathing shall:
A. Increase
B. Decrease
C. Stop
D. No effect
# Respiratory mechanism is controlled by:
A. Central nervous system
B. Sympathetic nervous system
C. Parasympathetic nervous system
D. Autonomic nervous system
# Respiratory centre of brain is stimulated by:
A. Carbon dioxide content in venous blood
B. Carbon dioxide content in arterial blood
C. Oxygen content in venous blood
D. Oxygen content in arterial blood
# At high altitude, RBCs of human blood will:
A. Increase in size
B. Decrease in size
C. Increase in number
D. Decrease in number
# Respiratory quotient is not less than one in:
A. Carbohydrates
B. Proteins
C. Fats
D. Normal diet
# Amount of oxygen absorbed by one gram of hemoglobin is:
A. 1.34 ml
B. 13.4 ml
C. 20 ml
D. 134 ml
# Hamburger's phenomenon is also known as:
A. HCO3 shift
B. Na+ shift
C. H+ shift
D. Chloride shift
# Oxygen dissociation curve of hemoglobin is:
A. Sigmoid
B. Hyperbolic
C. Linear
D. Hypobolic
# What is the percentage of hemoglobin in RBC?
A. 3%
B. 10%
C. 28%
D. 35%
# The breakdown product of hemoglobin is called:
A. Iron
B. Bilirubin
C. Hemocyanin
D. Skatol
# At higher CO2 concentration, oxygen dissociation curve of hemoglobin will:
A. Move to left
B. Move to right
C. Become irregular
D. Move upwardly
# During one circuit of blood from lungs to the tissue and back through the circulatory system, the percentage of hemoglobin giving the oxygen is:
A. 50%
B. 25%
C. 75%
D. 95%
# In anaerobic respiration:
A. O2 is taken in
B. CO2 is taken in
C. O2 is given out
D. CO2 is given out
# The covering of the lung is called:
A. Pericardium
B. Perichondrium
C. Pleural membrane
D. Peritoneum
# The alveolar epithelium in the lungs is:
A. Non ciliated columnar
B. Non ciliated squamous
C. Ciliated columnar
D. Ciliated squamous
# Inner/alveolar surface are of human lungs is:
A. 1 square meter
B. 10 square meters
C. 100 square meters
D. 1000 square meters
# Exchange of gases in lung alveoli occurs through:
A. Simple diffusion
B. Active transport
C. Passive transport
D. Osmosis
# The greatest quantity of air that can be expired after a maximum inspiration is called:
A. Residual volume
B. Tidal volume
C. Vital capacity
D. Lung volume
# At the time of inspiration, the diaphragm:
A. Expands
B. Contracts
C. Relaxes
D. Does not undergo any change
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