Tag: zoology

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Questions Related to zoology

Multiple choice zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

Dislocation of bones occurs in persons who have met with and met in accidents due to the

  1. Tendon break

  2. Break of skeletal muscle

  3. Ligament break

  4. Areolar tissue break
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ligament is the connective tissue which attaches two or more bones together to form a joint. When the ligament breaks, the two bones cannot be held together and dislocate. Generally, when the person met with an accident and the ligament is broken, there are chances that the person will suffer from the dislocation of the bones. 

Thus, the correct answer is option C. 

Multiple choice zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

Bones become fragile due to

  1. Arthritis

  2. Osteoporosis

  3. Gout

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Osteoporosis is defined as low bone mass and microarchitectural deterioration of the bone tissue, leading to enhanced bone fragility and a consequent increase in fracture risk.
  • It may occur due to various reasons such as calcium deficiency, increase in osteoclastic or osteoblastic activity, age, estrogen deficiency in females etc.
  • Hence bones become fragile (easily broken or damaged) due to osteoporosis.
  • So,the correct answer is 'Osteoporosis'.
Multiple choice zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

To treat myasthenia gravis, 

  1. Acetylcholine esterase activity is inhibited

  2. Receptors on motor end plate are reduced

  3. Secretion from nerve terminals is reduced

  4. Secretion from nerve terminals is enhanced
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Myasthenia gravis is a disease caused due to the antibodies produced by an immune system that blocks or destroy the receptor sites for a neurotransmitter called acetylcholine. The enzyme esterase or acetylcholine esterase break the acetylcholine and deactivates the neurotransmitter to stop muscle activation. 

During treatment of myasthenia gravis, it is prevented by using a chemical drug acetylcholinesterase inhibitor. These acetylcholinesterase inhibitors increase the amount of acetylcholine available and so help muscle activation and contraction.
So the correct option is 'Esterase activity is inhibited'.

Multiple choice zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

Which of the following endocrine gland is associated with tetanus?

  1. Islets of Langerhans

  2. Thyroid gland

  3. Parathyroid gland

  4. Adrenal gland
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Symptoms of tetanus include
 a)Tetanus often begins with mild spasms in the jaw muscles known as lockjaw. The spasms can also affect the facial muscles and experience spasms and stiffness in various muscles, especially those in jaw, abdomen, chest, back, and neck.
b)Muscle cramps or spasms in your legs, fever, high blood pressure etc
Hypoparathyroidism is decreased function of the parathyroid glands with underproduction of parathyroid hormone. This can lead to low levels of calcium in the blood, often causing cramping and twitching of muscles or tetany (involuntary muscle contraction).
Hence parathyroid gland is associated with tetanus.
So, the correct answer is 'Parathyroid gland'.

Multiple choice zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

Myasthenia gravis is an example of

  1. Viral disease

  2. Immunological disease

  3. Autoimmune disease

  4. Allergic reactions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Autoimmune diseases are a group of disorders in which tissue injury is caused by humoral(autoantibodies)or cell-mediated(by autoreactive T cells) immune response to self-antigens.
  • Myasthenia gravis is caused by an autoantibody against muscle antigen and acetylcholine receptor antigen.
  • Myasthenia gravis is characterized by increased muscular weakness the make one fatigue. speaking, breathing and talking becomes tired some. Hence myasthenia gravis is an example of autoimmune disease.
  • So, the correct answer is 'Autoimmune disease'.
Multiple choice zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

Progressive degeneration of skeletal muscle, mostly due to genetic disorder occurs in

  1. Myasthenia gravis

  2. Muscular dystrophy

  3. Arthritis

  4. Tetany

  5. Osteoporosis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Muscular dystrophy is a group of inherited muscle diseases in which muscle fibers are unusually susceptible to damage.
  • It is characterized by progressive skeletal muscle degeneration, defects in muscle proteins and the death of muscle cell and tissue.
  • Hence progressive degeneration of skeletal muscle, mostly due to genetic disorder occurs in muscular dystrophy.
  • So, the correct answer is 'Muscular dystrophy'.
Multiple choice zoology control and coordination in living organisms thymus thymus gland pineal gland and thymus

Mammals born without a thymus gland fail to manufacture 

  1. B - Lymphocytes

  2. T - Lymphocytes

  3. Plasma cells

  4. Basophils
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Removal of the thymus gland in the adult has little effect, but when the thymus is removed in the newborn, T cells in the blood and lymphoid tissue are depleted and failure of the immune system causes a gradual, fatal wasting disease. 

The animal whose thymus has been removed at birth is less able to reject foreign tissue grafts or to make antibodies to certain antigens. Moreover, certain parts of the white pulp of the spleen and lymph nodes are much reduced in size. Hence, the T cells produced in the thymus and transported to the lymphoid tissues are crucial elements in the development of immunity.

Multiple choice zoology control and coordination in living organisms thymus thymus gland pineal gland and thymus

Damage to thymus in a child may lead to

  1. Loss of cell mediated immunity

  2. A reduction in the haemoglobin content in blood

  3. A reduction in the amount of plasma proteins

  4. Loss of antibody mediated immunity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The thymus gland is an organ in the upper chest cavity, that processes lymphocytes, a type of white blood cell, that fights infections in the body. 

The thymus is most important in children and young adults, when it programs lymphocytes to attack antigens, like viruses. 
People who do not have this gland, or in whom it does not function correctly, usually have compromised immune systems and difficulty fighting disease.

Multiple choice zoology control and coordination in living organisms thymus thymus gland pineal gland and thymus

Which gland decreases in size with increasing age?

  1. Thyroid

  2. Adrenal

  3. Thymus

  4. Pituitary
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The thymus is a specialized organ of the immune system. Within the thymus, T cells or T lymphocytes mature. At birth, it is about 5 cm in length, 4 cm in breadth, and about 6 mm in thickness. The organ enlarges during childhood and atrophies at puberty. The thymus is at its largest in children. The thymus reaches maximum weight (20 to 37 grams) by the time of puberty. As one ages, the thymus slowly shrinks, eventually degenerating into tiny islands of fatty tissue. By the age of 75 years, the thymus weighs only 6 grams.