Tag: excretion in living organisms

Questions Related to excretion in living organisms

Which of the following is not an accessory excretory organ of vertebrates?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Skin

  2. Lungs

  3. Liver

  4. Heart

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Correct Option: D
Explanation:

The heart is a pumping organ. It helps in circulation of deoxygenated blood all through the body. These helps in the oxygenation of blood. It is mainly located in the thoracic region. The waste materials present in the blood is filtered by the kidney.

So, the correct answer is option D.

The 'Urinary System' of the human body consists of how many organs?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. 4

  2. 3

  3. 2

  4. 5

Show answer
Correct Option: A
Explanation:

The Urinary System, also known as the renal system or Urinary tract, consists of the kidneys, ureters, bladder, and the urethra .

So, the correct option is A. ( 4 )

Which of the following statements is wrong about the human excretory system?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Excretory system consists of one pair of bean shaped kidneys, one pair of ureter, a urinary bladder and a urethra

  2. Kidneys are situated between the 12th thoracic and 3rd lumber vertebrae close to the dorsal wall in abdominal cavity

  3. Right kidney is a little higher level than the left one

  4. All

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Correct Option: A

The ureter transports urine to the urinary bladder

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. True

  2. False

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Correct Option: A
Explanation:

True,

Urine passes from the pelvis into the ureter.
Both the ureters open through separate oblique opening into the urinary bladder.
Oblique openings prevent the backflow of urine.

The urethra is surrounded by sphincter muscles.

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

True,


Opening of urinary bladder in controlled by sphincters made of circular muscles. These got relax during urine release.

$\bullet$ Two sphincters are present human (inner involuntary,outer voluntary )

$\bullet$ Prostatic urethra is absent in female,  $\therefore$ both sphincters are present in membranous urethra.

The kidneys have built in mechanism for the regulation of glomerular filtration rate. One such efficient mechanism is carried out by juxtaglomerular apparatus(JGA). JGA is a specific sensitive region formed by
A. Afferent arteriole before it divides to form glomerulus
B. Cellular modifications in distal convoluted tubule where it is in contact with afferent arteriole
C. Macula densa cells
D. Glomerulus.

evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. A only

  2. A & B

  3. A, B & C

  4. A, B, C & D

Show answer
Correct Option: A

$CO _2$ is removed from the blood in the

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Ovaries

  2. Heart

  3. Kidney

  4. Lungs

Show answer
Correct Option: D
Explanation:

Blood containing carbon dioxide flows from veins throughout the body to the heart, and then the heart pumps it to the lungs. Small air sacs (alveoli) in the lungs remove the carbon dioxide from the blood and release it into the lungs where it is exhaled. 

So, the correct answer is option D.

Urine is stored in

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Kidney

  2. Urinary bladder

  3. Ureter

  4. Urethra

Show answer
Correct Option: B
Explanation:

Urine is made in kidney from the kidney the ureter transports urine into the urinary bladder. The urinary bladder is a muscular sac. When it is empty, it is about the size and shape of a pear. The bladder stores urine, allowing urination to be infrequent and can be controlled. Urge for urination starts as bladder comes to have urine 400-450 ml. In response, the stretch receptors on the walls of the bladder send signals to the CNS. The CNS passes on motor messages to initiate the contraction of smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter causing the release of urine.

So, the correct answer is 'Urinary bladder'.

Which of the following is used as artificial kidney in kidney failure patients?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Filter

  2. Angiogram

  3. Dialysis

  4. Ventilation

Show answer
Correct Option: C
Explanation:

The process of filtering the blood by the artificial kidney is known as dialysis. It is a method of removing excess water, nitrogenous wastes (urea), toxins from the blood in the patient who is rapidly developing loss of kidney function. It is also called renal replacement therapy. Hence dialysis is used as artificial kidney in kidney failure patients.

So, the correct answer is 'Dialysis'.

Kidneys are located in

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. The chest.

  2. The abdomen.

  3. The hands.

  4. The left side of body.

Show answer
Correct Option: B
Explanation:

The kidneys are a pair of organs found along the posterior muscular wall of the abdominal cavity. They are attached to the dorsal body wall at the level of 12th thoracic to the 3rd lumbar vertebra in the abdominal cavity. Thus option B is the correct answer.