Animal Tissue - Free MCQ Practice Test with solutions, UPSC Lucent

The brain is primarily composed of nervous tissue. Nervous tissue is specialized for communication and processing information. It consists of two main types of cells: neurons and neuroglia. Neurons are responsible for transmitting and processing electrical signals, while neuroglia provide support and protection to the neurons. Together, these cells form the complex network that allows the brain to function as the central control center of the body.

The lungs are covered by a double-layered membrane called the pleura. The pleura is a serous membrane that surrounds each lung individually. It consists of two layers: the visceral pleura, which is closely attached to the surface of the lung, and the parietal pleura, which lines the inner surface of the chest wall and diaphragm. The space between these two layers is called the pleural cavity and contains a small amount of pleural fluid, which acts as a lubricant, allowing the lungs to move smoothly during breathing. The pleura helps protect and support the lungs while facilitating their movement within the thoracic cavity.

The outer ear is primarily made of cartilage. Cartilage is a flexible and durable connective tissue that provides structure and support to various parts of the body. In the case of the outer ear, which is also known as the auricle or pinna, it is composed mainly of elastic cartilage. This type of cartilage allows the outer ear to maintain its shape while also providing some flexibility for movement and protection. The outer ear helps to capture sound waves and direct them into the ear canal, where they can be further transmitted to the middle and inner ear for processing.

Collagen is a fibrous protein that is one of the most abundant proteins in the human body. It plays a crucial role in providing structural support and strength to various tissues and organs. Collagen is found in connective tissues such as tendons, ligaments, skin, cartilage, and bones. It forms a strong and flexible framework that gives tissues their resilience and helps maintain their shape. Collagen also contributes to the healing and regeneration of tissues. Overall, collagen is an essential protein that provides structural integrity and support to different parts of the body.

Dentine is a calcified tissue of the body and along with enamel, cemented and pulp is one of the four major components of teeth.

Nerves are not classified as connective tissue. Nerves are a part of the nervous tissue, which is one of the four primary types of tissue in the body. Nervous tissue is responsible for transmitting electrical signals and coordinating the activities of different body parts. It is composed of specialized cells called neurons and supportive cells called neuroglia. Connective tissue, on the other hand, provides support, protection, and structural integrity to various organs and structures in the body. Examples of connective tissue include blood, bone, cartilage, and various types of fibrous connective tissue.

Cartilage is a type of connective tissue. Connective tissues are characterized by their extracellular matrix, which consists of protein fibers and ground substance. Cartilage is a flexible and semi-rigid connective tissue that provides structural support to various parts of the body. It is composed of specialized cells called chondrocytes, which are embedded in a matrix of collagen fibers and proteoglycans. Cartilage is found in many areas of the body, such as the joints, nose, ears, and certain parts of the respiratory system. It helps cushion and support joints, maintain the shape of structures like the nose and ears, and aid in the smooth movement of bones.

The fluid secreted by the lacrimal gland is tears. The lacrimal gland is located above the outer corner of each eye and produces tears to keep the eyes lubricated and moist. Tears contain a mixture of water, salts, proteins, enzymes, and antibodies. They help cleanse and protect the surface of the eye, moisturize the cornea, and provide nourishment to the surrounding tissues. Tears also play a role in emotional responses and can be produced in greater quantities during times of strong emotion or irritation.

The sebaceous glands are located in the dermis of the skin of a mammal. These glands are associated with hair follicles and are responsible for producing an oily substance called sebum. Sebum helps lubricate and waterproof the skin, preventing it from drying out and protecting it from external factors such as bacteria and environmental elements. The sebaceous glands are most abundant on the face and scalp but are found throughout the body, except for the palms of the hands and soles of the feet.

In the earliest stages of wound healing, fibroblasts are few and far between, suspended together with tenuous new blood vessels in an edematous pink substance termed granulation tissue.

Correct answer: A - Antonie van Leeuwenhoek.

In the 1670s, Antonie van Leeuwenhoek used single-lens microscopes to observe microscopic living organisms such as protozoa and spermatozoa; these observations are regarded as the first recorded identification of animal cells.

Earlier, in 1665, Robert Hooke described the small compartments he called cells while examining cork; those were plant cells (empty cell walls) and not observations of animal cells.

Therefore, the first observations of animal cells are attributed to Antonie van Leeuwenhoek, making option A correct.

The contractile protein of a muscle is myosin. Myosin is a type of protein that is involved in the contraction of muscle fibers. It forms the thick filaments in muscle cells and plays a vital role in the sliding filament mechanism of muscle contraction. Myosin interacts with another protein called actin, which forms thin filaments, to generate the force required for muscle contraction. During muscle contraction, myosin heads bind to actin, undergo a series of conformational changes, and pull the actin filaments closer together, resulting in the shortening and contraction of the muscle fiber.

Osteoblast is a large cell responsible for the synthesis and mineralization of bone during bone formation and bone remodeling.

The crown of a tooth is that part of the tooth that is covered with enamel and is the part usually visible in the mouth.

The Urinary bladder is lined with transitional epithelial tissue that can stretch significantly to accommodate large volumes of urine.

The lifetime of WBC in the lymph system is 13 to 20 days, and the existence of WBC is lost in the lymph system.

Camel hump is made from fatty adipose tissue. Adipose tissue is body fat, which is a type of loose connective tissue composed of adipocytes.

Fat is primarily stored in adipocytes, which are specialized cells found in adipose tissue. Adipose tissue is a type of connective tissue that is responsible for storing and releasing energy in the form of fat. Adipocytes are characterized by their large lipid droplets, which store triglycerides, and they make up the bulk of adipose tissue. The accumulation of fat in adipocytes can provide insulation, cushioning, and a source of energy for the body. Excess fat storage in adipose tissue can lead to obesity.

Fatty tissue, also known as adipose tissue, helps in keeping the body warm. Adipose tissue is a specialized type of connective tissue that primarily functions as a site for energy storage in the form of fat. It is rich in adipocytes, which store triglycerides. One of the important roles of adipose tissue is insulation and thermoregulation. The layer of fatty tissue under the skin acts as an insulating layer, reducing heat loss from the body and helping to maintain body temperature. The accumulation of fat in adipose tissue provides a source of stored energy that can be utilized during periods of increased energy demands, such as in cold environments.

Epithelial tissue is the protective tissue of the body. Epithelial tissue is composed of tightly packed cells that form the outer layer of the body surfaces, such as the skin, as well as lining the internal cavities and organs. It serves as a protective barrier that helps to prevent the entry of pathogens, chemicals, and other harmful substances into the body. Epithelial tissue also plays a role in absorption, secretion, and sensation. Its cells are often closely joined together and may have specialized features like cilia or microvilli to enhance their functions. Overall, epithelial tissue acts as a protective covering for various parts of the body and contributes to the maintenance of homeostasis.