20 Questions MCQ Test Science & Technology for UPSC CSE - Test: Animal Tissues - 1
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Tissue is a cellular organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
Simple Squamous Epithelia Simple squamous epithelia are tissues formed from one layer of squamous cells that line surfaces. Squamous cells are large, thin, and flat and contain a rounded nucleus. Like other epithelial cells, they have polarity and contain a distinct apical surface with specialized membrane proteins. These epithelia are common where absorption or transport of materials is important. They also play a role in diffusion, osmosis and filtration. This makes them important in the kidney, in the alveoli of lungs and in the walls of capillaries.
Since this epithelium is made of a single layer of thin cells that are tightly packed together, it is the ideal medium for selective transmembrane transport. Some substances, such as oxygen from the lungs travel mostly along their concentration gradient towards the blood. Others are actively transported using membrane-bound carrier proteins.
The three principal shapes associated with epithelial cells are - squamous, cuboidal and columnar. Squamous epithelium has cells that are wider than their height (flat and scale-like). This is found as the lining of the mouth, oesophagus, the blood vessels and in the alveoli of the lungs.
Rhinocerotidae: The "horns" of rhinoceroses are made of keratin, the same substance as fingernails, and grow continuously, but do not have a bone core. Chamaeleonidae: Many chameleons, most notably the Jackson's Chameleon, possess horns on their skulls, and have a keratin covering.
These exocrine glands are enlarged and modified sweat glands and are the characteristic of mammals which gave the class its name. The basic components of the mammary gland are the alveoli (hollow cavities, a few millimetres large) lined with milk-secreting cuboidal cells and surrounded by myoepithelial cells.
Wrinkling in old age is due to collagen. Because intrinsic aging is the natural aging process that place over the years regardless of outside influence. After the age of 20, A person produces about 1percent less collagen in the skin each year. As a result the skin becomes thinner with age.
The dermis forms the bulk of the mammalian skin. It is composed of an association of connective tissue fibres, mainly collagen, with a ground substance of mucopolysaccharide materials (glycosaminoglycans), which can hold a quantity of water in its domain.
D is the correct option.The fat stored in adipose tissue comes from dietary fats or is produced in the body. hormone signaling; adipose tissueWhen hormones signal the need for energy, fatty acids and glycerol are released from triglycerides stored in fat cells (adipocytes) and are delivered to organs and tissues in the body.
Cartilage is produced by chondroblasts. explanation :-chondroblasts connective tissue is comprised of living cells within an extracellular matrix. the extracellular matrix in cartilage is produced by specialized cells called chondroblasts.
OSTEOBLASTS are the cells that form new bone. They also come from the bone marrow and are related to structural cells. They have only one nucleus.Osteoblasts work in teams to build bone. They produce new bone called "osteoid" which is made of bone collagen and other protein.
Haversian system (named for Clopton Havers) is the fundamental functional unit of much compact bone. Osteons are roughly cylindrical structures that are typically several millimeters long and around 0.2 mm in diameter. They are present in many bones of most mammals and some bird, reptile, and amphibian species.
Your body is slightly alkaline, with a pH between 7.35 and 7.45. Your stomach is very acidic, with a pH of 3.5 or below, So it can break down food. And your urine changes, depending upon what you eat - that’s how your body keeps the level in your blood steady.
D is the correct option.The circular mammalian erythrocyte is synthesized in the bone marrow. After synthesis it undergoes a process called enucleation in which the nucleus is removed. The absence of a nucleus allows the red blood cells to contain more hemoglobin and hence carry more oxygen.
Human red blood cells are formed mainly in the bone marrow and are believed to have an average life span of approximately 120 days. Human red blood cells are formed mainly in the bone marrow and are believed to have an average life span of approximately 120 days.
Striated muscles are found in - skeletal muscles. more Skeletal muscle is a specialized contractile tissue found in animals which functions to move an organism’s body. Skeletal muscle is comprised from a series of bundles of muscle fibers, surrounded by protective membranes. This arrangement allows skeletal muscle to contract quickly and release quickly without subjecting the individual fibers to too much friction. Skeletal muscle tissue can be found across the animal kingdom, in most multi-cellular forms of life.
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