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A Combination of two tissues is responsible for the movement of our body.
Namely,
- Muscular tissue
- Nervous tissue
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Yogita Ingle 7 years, 3 months ago
Tissues are groups of similar cells that perform a particular function. We will be examining human tissues as an example of animal tissues.
Human bodies, like most animal bodies, are made up of four different types of tissue:
- Epithelial tissue forms the outer layer of the body and also lines many of the bodies cavities where it has a protective function.
- Connective tissue assists in support and protection of organs and limbs and depending on the location in the body it may join or separate organs or parts of the body.
- Muscle tissue enables various forms of movement, both voluntary and involuntary.
- Nerve tissue is responsible for the carrying of electrical and chemical signals and impulses from the brain and central nervous system to the periphery, and vice versa.
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Yogita Ingle 7 years, 3 months ago
The sparks coming out of a grinding stone are tangential to the rotating stone. It is due to directional inertia. Once the sparks are produced, no external force acts on the sparks and so the direction of motion cannot change. The sparks so produced follow paths tangential to the grinding stone.
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Yogita Ingle 7 years, 3 months ago
Kingdom Animalia has approximately 36 sub-divisions known as 'phyla'. Each phyla share particular properties structurally and functionally which together separate it from other phyla. Below are the most common phyla classified under traditional biological methodology.
Phylum Porifera - They are primitive organisms, most of them are salt-water sponges. They do not have organs or nerve cells or muscle cells. Approximately, 8,000 species exist today. Example: Sycon, Euspongia, Spongilla.
Phylum Coelentrata (Cnidaria) - This group is composed of jelly-fish and other lower aquatic animals. Approximately, 15,000 species exist today.Example: Aurelia, Adamsia.
Phylum Platyhelminthes - This group consists of flat worms. They inhabit both marine and fresh water habitats and they are mostly endoparasites found in animals. Example: Taenia, Fascicola.
Phylum Aschelmeinthes - It is a group of round worms, most of them are parasites. This phylum consists of about 80,000 parasitic worms.
Phylum Annelida - They are present in aquatic, terrestrial and are free-living or parasitic in nature. This phylum comprises of segmented worms. Example: Earthworm, Leech etc.
Phylum Arthropoda - This is the largest phylum which consists of insects. There are over 1 million species of insects existing today. Example: Locusts, Butterfly, Scorpion, Prawn.
Phylum Mollusca - It is the second largest phylum. They are terrestrial and aquatic. Example: Pila, Octopus.
Phylum Echinodermata - This consists of sea stars and sea urchins. There are about 6,000 species. Example: Asteria, Ophiura.
Phylum Chordata - Animals of this phylum have a characteristic feature of presence of notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. Within this phylum advanced group called vertebrates which include fish, amphibians, reptiles, birds and mammals
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Echocardiography or simply an echo is a sonogram of the heart. Echocardiography uses standard two-dimensional, three - dimensional, and Doppler ultrasound to create images of the heart.
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Properties of the cathode rays:
1) Cathode rays travels in a straight lines and are made up of negatively charged particles called electrons.
2) When cathode rays are focused on a thin metal foil, it gets heated up to incandescence.
3) Cathode rays consists of material particles: This is indicated by the fact that when a light paddle wheel is placed in the path of cathode rays it starts rotating.
4)Cathode rays ionize the gas through which they passed.
5) Effect of electric field: Under influence of the electric field cathode rays deflected towards the positive plate showing that they themselves are negatively charged.
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Monocotyledons commonly referred to as monocots, are flowering plants (angiosperms) whose seeds typically contain only one embryonic leaf, or cotyledon. They constitute one of the major groups into which the flowering plants have traditionally been divided, the rest of the flowering plants having two cotyledons and therefore classified as dicotyledons, or dicots.
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Yogita Ingle 7 years, 3 months ago
The number of water molecules chemically combined in a definite molecular proportion with the salt in the crystalline state are called water of crystallisation.
Salts that contain a definite number of water molecules as water of crystallisation are called hydrated salts.
Example: Gypsum and washing soda.
Conversely, salts that do not contain water of crystallisation are called anhydrous salts.
Example: Anhydrous copper sulphate.
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Yogita Ingle 7 years, 3 months ago
The process of formation of the biological membranes is called membrane biogenesis. The endoplasmic reticulum is responsible for the synthesis of these membranes.
Membrane biogenesis involves the synthesis of cell membrane with the help of proteins and lipids. Endoplasmic reticulum is responsible for the synthesis of these membranes.
Membranes synthesised by this process of membrane biogenesis help in dividing the cell into structural and functional compartments. Membranes of the cell altogether are called as endomembrane system. The endomembrane system includes different membranes suspended in the cytoplasm and the plasma membrane.
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