Explanation
[A] In man, about 55% of blood is blood plasma, a fluid that is the blood's liquid medium, which by itself is colourless and has enucleated RBC. So, a matches r.
[B] In earthworm, blood is reddish in colour. It is formed of plasma and corpuscles. The corpuscles are amoeboid, colourless and the RBCs are nucleated. The plasma contains a red pigment called haemoglobin. So, b matches s.
[C] Cockroaches have white blood because cockroaches lack haemoglobin in their blood. So, c matches p.
[D] Frog blood is similar to human blood in its basic structure. Like human blood, frog blood is mainly made of the liquid plasma matrix and red blood cells. Plasma is colourless with nucleated RBC and no platelets. So, e matches q.
Thus, the correct answer is A.
The periodic gap in the insulating sheath (myelin) on the axon of certain neurons serves to facilitate the rapid conduction of nerve impulses is known as node Ranvier.So, the correct answer is 'Node of Ranvier'.
Striated muscles are the voluntary muscles which have overlapping contractile myofilaments. These are made up of a contractile protein known as actin and myosin.
The connective tissue which wraps the whole muscle is termed as epimysium. It is a fibrous elastic type of tissue.
Perimysium is the connective tissue that wraps bundles of muscle fibres.
Endomysium is the layer of areolar connective tissue. It ensheaths each individual muscle fibre. It also contains capillaries, nerves, and lymphatics.
So, the correct option is B.
1. Gap junctions facilitate the cells to communicate with each other. So, this is a wrong statement.
2. Areolar tissue contains various cells like fibroblasts, macrophages, adipocytes, mast cells, and plasma cells. This statement is true.
3. Tight junctions help to stop substances from leaking across tissues. So, it is a wrong statement.
4. Adhering junctions cement the adjacent cells together. Hence, it is a wrong statement.
5. Cells of connective tissue except blood secrete fibers of structural proteins called elastin. It is a true statement.
Hence, the correct option is B. Because I, III, and IV only are wrong answers.
Areolar tissue is the type of connective tissue. These are made of cells and extracellular matrix. The matrix has two components which are fibres and ground substance. It consists of the various cells - fibroblast which secretes collagen. Macrophages help in phagocytosis and mast cells which help in the allergic and inflammatory response. These are absent in adipose tissues, glandular, and compound epithelium.
Therefore, the correct answer is option B.
[a] Simple squamous epithelium is found in alveoli of lungs, capillaries, glomeruli, and other tissues where rapid diffusion is required.
[b] Simple cuboidal epithelium is found in thyroid glands, kidney tubules, glandular ducts and ovaries, and the thyroid gland.
[c] Non-ciliated simple columnar epithelium lines the organs of the digestive tract including the stomach, small intestine, and large intestine.
[d] The transitional epithelium is found in the urinary bladder, ureters, and gland ducts of the prostate.
[e] Pseudostratified non-ciliated columnar epithelium lines the epididymis of the male reproductive system.
So, (a)-(iii), (b)-(iv), (c)-(v), (d)-(i), (e)-(ii)
Therefore, the correct answer is option A.
A. The epicardium is the outermost layer of our heart
B. The endocardium is the innermost layer of our heart. It lines the inner surfaces of the heart chambers which also includes the heart valves.
C. The cardiac muscle layer of the heart is known as the myocardium. These are made up of cardiomyocytes. The myocardium is found in the walls of all four chambers of the human heart.
So the correct answer is Myocardium. Thus the correct option is C.
In Stratum lucidum, the layer is thicker on the palms and soles. The layer consists of several rows of clear, flat and dead cells. It contains the droplets of a clear substance called eleidin.
In Stratum granulosum, three to five rows of flattened cells are found, containing keratohyalin as a substance. In Stratum corneum, twenty-five to thirty rows of flat, dead cells which are completely filled with keratin
In Stratum spinosum, eight to ten rows of the polyhedral cells that fit closely together make up this layer of the epidermis.
So the correct answer is option A.
Please disable the adBlock and continue. Thank you.
