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question_answer1) Assertion : Total count of RBC comes out to be very low in polycythemia. Reason : Number of erythrocytes get reduced in the condition of polycythemia.
question_answer2) Assertion : Haemoglobin is said to be a conjugated protein. Reason : It is composed of a protein called haem and a non-protein iron porphyrin complex called globin.
question_answer3) Assertion : Serum can not be coagulated. Reason : Serum lacks the protein fibrinogen.
question_answer4) Assertion : Chilling of blood decreases coagulation time. Reason : Cold depresses the action of coagulation promoting enzymes.
question_answer5) Assertion : Thrombin is necessary to initiate blood coagulation. Reason : Thrombin helps in the formation of thromboplastins.
question_answer6) Assertion : Muscle fibres are said to be contractile in nature. Reason : Cells of muscle tissues can shorten forcefully and again return to the relaxed state.
question_answer7) Assertion : Blood can be coagulated by adding oxalate (Sodium or Potassium Oxalate) to it. Reason : Oxalate depresses the action of anticoagulant present in the blood.
question_answer8) Assertion : Muscle cells are also called myofibrils. Reason : Muscle cells are very thin and elongated.
question_answer9) Assertion : Thigh muscles can get tired but not the muscles of ventricle of heart. Reason : Muscles of thigh are voluntary whereas that of heart are involuntary muscles.
question_answer10) Assertion : Smooth muscle fibres do not appear to be striated. Reason : This is due to regular alternate arrangement of thick and thin filaments is smooth muscle fibre.
question_answer11) Assertion : Non-striated muscles are said to be voluntary in nature. Reason : Non-striated muscles can be moved according to will.
question_answer12) Assertion : Intercalated discs are important regions of cardiac muscle cells. Reason : Intercalated discs function as boosters for muscle contraction waves.
question_answer13) Assertion : Presence of connective tissue inside the brain is essential for conduction of nerve impulse. Reason : Connective tissue hold together the nerve cells of brain.
question_answer14) Assertion : Neurons are said to possess the property of excitability. Reason : Neurons can get excited by a given stimulus.
question_answer15) Assertion : Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason : This is due to the absence of nissl?s bodies in node of Ranvier.
question_answer16) Assertion : Extracellular materials help in separation of cells. Reason : Cell junctions are formed by extra cellular materials.
question_answer17) Assertion : Epithelial tissues protect the under lying and over lying tissues. Reason : Materials are exchanged at the surfaces across the epithelial tissues.
question_answer18) Assertion : Materials cannot be exchanged between epithelial cells. Reason : Blood vessels are absent in epithelial tissue.
question_answer19) Assertion : The cells of columnar epithelium in absorptive surfaces often bears microvilli on their free ends. Reason : Microvilli on their free ends.
question_answer20) Assertion : Ciliated epithelium helps in movement of particles. Reason : Cilia help in movement.
question_answer21) Assertion : Fibroblasts help in protection. Reason : Fibroblasts synthesize two kinds of protein which are protective in nature.
question_answer22) Assertion : Pinna of ear is elastic in nature. Reason : Hyaline cartilage present in pinna.
question_answer23) Assertion : Lining of some hollow organs & cavities are moist. Reason : This is because of the mucus secreted by the connective tissue.
question_answer24) Assertion : Extracellular materials are important for cells. Reason : Intercellular materials surround the cells & bind them together.
question_answer25) Assertion : Simple epithelium covers surfaces exposed to mechanical or chemical abrasions. Reason : Protection of underlying tissues is the major function of simple epithelium.
question_answer26) Assertion : Materials are exchanged between epithelial & connective tissue by diffusion. Reason : Blood vessels are absent in epithelial tissue.
question_answer27) Assertion : Urinary bladder can considerably expand to accommodate urine. Reason : It is lined by stretchable squamous epithelium.
question_answer28) Assertion : Exocrine glands are also known as ductless glands. Reason : Thyroid gland directly pour its secretion i.e. thyroxine, into the blood.
question_answer29) Assertion : Columnar epithelium lining the intestinal mucosa appears to have a brush like appearance. Reason : A large number of microvilli are present on brush bordered columnar epithelium.
question_answer30) Assertion : Ciliated epithelium is present in the inner lining of trachea & large bronchi. Reason : Ciliary movements propel the mucus & foreign particles towards the larynx.
question_answer31) Assertion : Mast cells help in body defence. Reason : Mast cells phagocytose & destroy microbes.
question_answer32) Assertion : Surface of skin is impervious to water. Reason : Surface of skin is covered by stratified cuboidal epithelium.
question_answer33) Assertion : Tendon is present in all bone joints. Reason : Tendon connects the bones at the joints & hold them in position.
question_answer34) Assertion : Deposits of protein keratin are present in deeper layers of stratified keratinised squamous epithelium. Reason : Keratin makes this epithelium impervious to water.
question_answer35) Assertion : Bones possess longitudinal canals called lacunae. Reason : Lacunae carry blood vessels & nerves to the bones.
question_answer36) Assertion : Fat is the inability of a muscle to relax. Reason : It is due to lactic acid accumulation by repeated contraction. [AIIMS 1998]
question_answer37) Assertion : Cartilage (protein matrix) and bone (calcium matrix) are rigid connective tissue. Reason : Blood is connective tissue in which plasma is the matrix. [AIIMS 2001]
question_answer38) Assertion : Specialization of cells is advantageous for the organism. Reason : It increase the operational efficiency of an organism. [AIIMS 2002]
question_answer39) Assertion : Histamine is related with allergic and inflammatory reactions. Reason : Histamine is a vasodilator.
question_answer40) Assertion : WBCs accumulate at site of wounds by diapedesis. Reason : It is squeezing of leucocytes from endothelium. [AIIMS 2002]
question_answer41) Assertion : The regulation of RBC production is accomplished by FSH. Reason : Erythropoietin, hormone circulates to red bone marrow where it increases stem cell mitosis and speed up development of RBCs. [AIIMS 2002]
question_answer42) Assertion : Mast cells in the human body release excessive amounts of inflammatory chemicals which cause allergic reactions. Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals. [AIIMS 2003]
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