Tag: secretory organs

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Questions Related to secretory organs

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Consider the following statements :I. Nicotinamide (anti pellagra) occurs in milk, yeast, meat and leafy vegetables
II. Crypts of Lieberkuhn occur in liver
III. Steapsin is pancreatic amylase

  1. II and III are correct

  2. II and III are incorrect

  3. I and II are correct

  4. I and III are correct

  5. I and III are incorrect
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nicotinamide is indeed a vitamin (B3). Crypts of Lieberkuhn are in the small intestine, not the liver. Steapsin is pancreatic lipase, not amylase. Thus, statements II and III are incorrect.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Organs functioning as modulator and effector for homeostatic control of blood sugar are respectively

  1. Liver and islets of Langerhans

  2. Islets of Langerhans and hypothalamus

  3. Hypothalamus and islets of Langerhans

  4. Hypothalamus and liver.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The liver acts as a modulator by storing or releasing glucose (glycogenolysis/glycogenesis), while the islets of Langerhans (pancreas) act as effectors by secreting insulin and glucagon to control blood sugar levels.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Angiotensinogen is a protein produced by

  1. Macula densa cells

  2. Liver cells

  3. Juxtaglomerular cells

  4. Endothelial cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Angiotensinogen is a plasma protein produced and secreted by liver cells. It is a sole precursor of all angiotensin peptide. Juxtaglomerular cells secrete renin which acts on angiotensinogen to release angiotensin I and then it is converted to angiotensin II by the action of enzyme angiotensin-converting enzymes.
So, the correct answer is 'Liver cells'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

If liver is removed, which component of blood will increase?

  1. Ammonia

  2. Protein

  3. Uric acid

  4. Urea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Animals accumulate ammonia, urea, uric acid, carbon dioxide, water and ions like Na +, K+, Cl–, phosphate, sulphate, etc., either by metabolic activities or by other means like excess ingestion. 
  • These substances have to be removed totally or partially. Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals.  Ammonia is rapidly removed from the liver by urea cycle.
  • Urea cycle takes place in the liver in which the ammonia is converted into a water-soluble compound known as urea. Urea formed is a non-toxic excretion product whereas Ammonia is toxic to the CNS because it reacts with the α-ketoglutarate to form glutamate. Hence, If the liver is removed, which component of blood will increase is ammonia.
So, the correct answer is 'ammonia'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Lymphocytes of lower vertebrates are produced in

  1. Liver

  2. Spleen

  3. Bone marrow

  4. Vertebrae.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In many lower vertebrates, the liver serves as a hematopoietic organ, producing various blood cells including lymphocytes, unlike in mammals where this is primarily the role of bone marrow.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Consider the following statements.
a. Beta-oxidation takes place only in glyoxisomes and not in cytosol.
b. When fatty acids undergo betaoxidation to form acetyl coA, only NADH is produced and not $FADH _2$.
Which of the statements given is/are correct?

  1. $1$ only
  2. $2$ only
  3. Both $1$ and $2$
  4. Neither $1$ nor $2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Beta-oxidation occurs in the mitochondria and peroxisomes (not just glyoxisomes) of the cytosol. During beta-oxidation, both NADH and FADH2 are produced in each cycle.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Which of the following lipoproteins in blood remove excess cholesterol from body cells and transport it to the liver for elimination ?

  1. HDL

  2. LDL

  3. VLDL

  4. Both (B) and (C)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

High-density lipoprotein (HDL) is known as 'good cholesterol' because it transports cholesterol from tissues back to the liver for excretion or recycling.