Tag: evs - i

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Multiple choice evs - i more about organ system human lymphatic system lymph and its function lymph and tissue fluid introduction to excretory system structures and functions related to the excretory system introduction to excretion

Mucus is secreted by the

  1. Stomach

  2. Duodenum

  3. Large intestine

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stomach - Foveolar cells are mucus-producing cells, which cover the inside of the stomach, protecting it from the corrosive nature of gastric acid. The mucus produced by these cells is extremely important, as it prevents the stomach from digesting itself.
Duodenum - Brunner's glands (or duodenal glands) are compound tubular submucosal glands present in the duodenum. The main function of these glands is to produce a mucus-rich alkaline secretion (containing bicarbonate) in order to: protect the duodenum from the acidic content of chyme (which is introduced into the duodenum from the stomach); provide an alkaline condition for the intestinal enzymes to be active, thus enabling absorption to take place and lubricate the intestinal walls.
Large intestine - Goblet cells reside throughout the length of the small and large intestine and are responsible for the production and maintenance of the protective mucus blanket by synthesizing and secreting high-molecular-weight glycoproteins, known as mucins. 

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Teeth not found in

  1. Primitive jawless fishes

  2. Lampreys

  3. Sharks

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Teeth appear to have first evolved in sharks, and are not found in the more primitive jawless fish. Lampreys do have tooth-like structures on the tongue, these are in fact, composed of keratin, not of dentine or enamel, and bear no relationship to true teeth. 

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Incisor present in which bone of human jaw?

  1. Premaxilla

  2. Maxilla

  3. Palatine

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The premaxilla is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. 
  • In humans, they are fused with the maxilla and usually termed as the incisive bone (the portion of the maxilla adjacent to the incisors). Hence,  Incisor is present in premaxilla of the human jaw.
So, the correct answer is 'premaxilla'.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Consider the following statements:
$1$. Lymph transports oxygen to brain.
$2$. Lymph returns the intestinal fluid to the blood.
$3$. Lymph is modified blood that contains all except RBCs and certain proteins.
Which of the statement(s) given is/are correct?

  1. Only $2$
  2. $1$ and $2$
  3. $2$ and $3$

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lymph does not transport oxygen (that is the role of blood/hemoglobin). Lymph returns interstitial fluid to the blood and is similar to blood plasma but lacks RBCs and certain large proteins.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Consider the following statements: 
1. A major part of CO$ _2$ transport occurs in blood in the form of bicarbonate.
2. O$ _2$ transport occurs via haemoglobin of RBC in the body.
3. Carbon monoxide combines with haemoglobin to form carboxyhaemoglobin.
4. Pneumoconiosis affects the workers who work mainly in coal mining industry.
Which of the statements given above are correct?

  1. 1, 2, 3 and 4

  2. 1, 2 and 3

  3. 2, 3 and 4

  4. 1 and 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All four statements are correct: CO2 is transported as bicarbonate, O2 is carried by hemoglobin, carbon monoxide binds to hemoglobin (forming carboxyhemoglobin), and pneumoconiosis is a lung disease caused by inhaling dust like coal dust.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Which chamber of the human heart pumps fully oxygenated blood to the aorta and hence to the body?

  1. Right auricle

  2. Left auricle

  3. Right ventricle

  4. Left ventricle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The left ventricle is the thick-walled chamber responsible for pumping oxygenated blood into the aorta, which then distributes it throughout the systemic circulation. The right side of the heart handles deoxygenated blood.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

If the radius of the blood vessel decreases, the blood pressure will ________.

  1. increase

  2. decrease

  3. remains same

  4. increases in male but decreases in female
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the principles of fluid dynamics, as the radius of a blood vessel decreases (vasoconstriction), the resistance to blood flow increases. To maintain flow, the blood pressure must increase.