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During heavy breathing, in case of exhalation, which of the following muscles contract?

1) Diaphragm 2) External intercostal muscles 3) Sternocleidomastoid 4) Internal intercostal muscles Answer:4) Internal intercostal muscles... View Article

Thoracic breathing takes place during

i) Emergency situation ii) Vigorous exercise iii) Rest and sleep 1) Only i is correct 2) Only ii is correct 3) i and ii are correct 4) ii and... View Article

During inspiration the external intercostal muscles _ and the ribs move .

1) relax, upwards and outwards 2) contract, upwards and outwards 3) relax, downwards and inwards 4) contract, downwards and inwards Answer:2)... View Article

During inspiration, the diaphragm _ and the expansion of the thoracic cavity is in the __ direction.

1) contracts, dorso-ventral 2) contracts, longitudinal 3) relaxes, dorso-ventral 4) relaxes, longitudinal Answer:2) contracts, longitudinal... View Article

Inspiration occurs when the pressure within the lungs is

1) less than the atmospheric pressure 2) greater than the atmospheric pressure 3) equal to the atmospheric pressure 4) none of the above... View Article

What is the pulmonary volume of air inhaled by a person under normal condition after he forcefully exhales out?

1) TV 2) TV+ERV 3) TV+IRV 4) TV+ERV+IRV Answer:2) TV+ERV Explanation: Tidal volume (TV) is the amount of air inspired or expired during normal... View Article

What is the correct sequence of passage of air during inspiration?

1) Larynx → Trachea → Bronchiole → Bronchi → Alveoli 2) Larynx → Pharynx → Trachea → Bronchiole → Bronchi... View Article

Spot the incorrect statement about exchange of gases in animals.

1) Fishes have counter-current exchange of gases 2) Molluscs use gills whereas earthworms use moist skin for respiration 3) Frogs respire through... View Article

The elements of xylem tissue that store tannins are:

1) tracheids 2) xylem parenchyma 3) vessels 4) xylem fibres Answer:2) xylem parenchyma Explanation: Xylem parenchyma is the only living... View Article

Companion cells are associated with

1) xylem 2) cambium 3) sieve tubes 4) collenchyma Answer:3) sieve tubes Explanation: Companion cells are specialised parenchymatous cells that... View Article

The portion of apical meristem that gives rise to xylem tissue is called

1) protoxylem 2) procambium 3) metaxylem 4) tracheid Answer:2) procambium Explanation: Procambium gives rise to xylem and phloem. The... View Article

What is true about unmyelinated nerve fibre?

1) Not enclosed by both Schwann cells and a myelin sheath 2) Enclosed by Schwann cells that do not form a myelin sheath 3) Not enclosed by... View Article

The synaptic vesicles discharge

1) acetylcholine 2) adrenaline 3) epinephrine 4) all of the above Answer:4) all of the above Explanation: Synaptic vesicles contain... View Article

Node of the Ranvier is the place where

1) myelin sheath and neurilemma are discontinuous 2) axolemma is absent 3) axolemma is discontinuous 4) myelin sheath is discontinuous Answer:4)... View Article

Which of the following is not strictly considered a part of the neuron?

1) Dendrites 2) Myelin sheath 3) Nissl’s granules 4) Synaptic knob Answer:2) Myelin sheath Explanation: Myelin sheath is not strictly... View Article

Sympathetic neural system

1) increases heart rate 2) increases secretion of saliva and digestive juices 3) activates adrenal gland to meet an emergency 4) both 1 and 3... View Article

The study of morphology, physiology and pathology of the neural system is known as

1) neurology 2) histology 3) entomology 4) cytology Answer:1) neurology Explanation: Neurology is the study of the neural system. Histology is... View Article

_ and __ are the specific receptors of the vestibular apparatus responsible for maintenance of balance of the body and posture.

1) Saccule; utricle 2) Saccule; macula 3) Crista; utricle 4) Crista; macula Answer:4) Crista; macula Explanation: The crista and macula are the... View Article

The malleus is attached to the

1) pinna 2) stapes 3) oval window of the cochlea 4) tympanic membrane Answer:4) tympanic membrane Explanation: The malleus is attached to the... View Article

Auditory cortex is located in the

1) cerebellum 2) hypothalamus 3) cerebrum 4) corpus callosum Answer:3) cerebrum Explanation: Auditory cortex is a part of the cerebrum. It... View Article

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