Class 9, Science, Chapter-6, Lecture-4, Animal Tissues (Notes)
Differences between:
Squamous Epithelium | Columnar Epithelium |
The cells are thin and flat. | The cells are pillar-like. |
The nuclues lies in the centre which is generally bulged out. | The nucleus lies near the base. |
It occurs in lung alveoli, blood capillaries, Bowman’s capsule, buccal cavity, skin, etc. | It occurs in lining layer of stomach and intestine, their glands and covering of epiglottis. |
It functions as selectively permeable barrier, in ultra filtration and bear wear and tear. | It takes part in absorption, secretion and protective covering. |
Difference Between:
Tendon | Ligament |
It is tough and inelastic. | It is strong but elastic. |
Bundles of white collagen fibres are parallel. | Bundles of white collagen fibres are arranged in various directions. |
Yellow elastic fibres are absent. | Yellow elastic fibres are present in large number. |
It connects a muscle to a bone. | It joins a bone with another bone. |
Differences Between:
Bone | Cartilage |
It is hard and inflexible. | Cartilage is comparatively soft and flexible. |
Matrix is made up of protein complex ossein. | Matrix is formed of protein complex chondrin. |
Blood supply passes into the interior of bone. | Blood supply is restricted to the outside. |
A marrow cavity is often present in the interior. | A marrow cavity is always absent. |
Matrix shows concentric lamellae. | Matrix is homogeneous. |
Bone cells occur singly. | Cartilage cells occur singly, in twos or fours. |
Matrix possesses abundant quantity of mineral salts, especially phosphates and carbonates of calcium and magnesium. | Deposition of minerals is rare. |
Differences Between:
Red Blood Cells (Erythrocytes) | White Blood Cells (Leucocytes) |
They are red in colour. | They are colourless. |
It is about 7.2 m. | It varies between 10-20 m. |
Their number is 4-6 million/mm3. | The number is 5000-8000 /mm3. |
They are biconcave rounded. | The shape is rounded to amoeboid. |
Nucleus is absent. | Nucleus is present. |
Most of the cell organelles are absent. | Cell organelles are present. |
The cells contain haemoglobin. | Haemoglobin is absent. |
Life span is 120 days. | Life span is generally shorter (a few hours to four days). |
They transport oxygen and to some extent carbon dioxide. | They function in defence and immunity. |
Differences between:
Blood | Lymph |
It is opaque, viscous and reddish fluid. | It is transparent, thinner and light yellow fluid. |
It is about 50% | It is about 94%. |
Blood contains erythrocytes. | Erythrocytes or RBCs are absent. |
They are present. | Platelets are absent. |
The number is 5000-8000/mm3. | The number is about 500/mm3. |
It has nearly uniform composition. | Composition varies with the tissue. |
It transports various materials, nutrients, gases and wastes in the body. | It functions as middle man between tissues and blood. |