IGCSE Biology Paper-4: Specimen Questions with Answers 165 - 167 of 279

Passage

The figure below shows a section through a kidney.

Human Kidney

Question 165 (1 of 2 Based on Passage)

Edit

Write in Short

Short Answer▾

Name the processes resulting in the reabsorption of

  • glucose
  • water

Explanation

Selective Reabsorption

  • Discovered by Richard and supporters.
  • P. C. T. : P. C. T. is the pivotal site for reabsorption.
  • Glucose, amino acid and , ions are reabsorbed by active transport.
  • are reabsorbed by passive transport following the positively charged ions.
  • Active uptake of ions reduces the concentration of the filtrate and an equivalent amount of water passes into the peritubular capillaries by osmosis. (Here water is reabsorbed by passive transport. It is also known as obligatory water reabsorption) . Most of the important buffer bicarbonate is also reabsorbed from the filtrate. P. C. T. absorb nearly of filtered bicarbonate. Some urea is reabsorbed by diffusion. The rest remain in the filtrate for removed in the urine.

Question 166 (2 of 2 Based on Passage)

Edit

Write in Short

Short Answer▾

Using label lines and the letters given, label the following on a copy of the figure:

X where filtration occurs

Y the renal artery

Z where urine passes to the bladder

Explanation

Human Kidney

Passage

Shows the human gas exchange system. The functions of the parts of the gas exchange system are given in Table.

Human Gas Exchange System

Question 167 (1 of 2 Based on Passage)

Write in Short

Short Answer▾

Complete Table.

The Functions of the Parts of the Gas Exchange System
functionletter on Fig.name
structure that makes sounds
bone that provides protection for the lungs
airway that allows passage of air only into the right lung
airway that allows passage of air into both lungs
site of gas exchange
muscle that contracts to lower the ribcage
contracts to increase volume of thorax

Explanation

The Functions of the Parts of the Gas Exchange System
functionletter on

Fig. 19.1

name
structure that makes soundsPLarynx
bone that provides protection for the lungsTRibs
airway that allows passage of air only into the right lungCRight main bronchus
airway that allows passage of air into both lungsQTrachea
site of gas exchangeSAlveoli
muscle that contracts to lower the ribcageMDiaphragm
contracts to increase volume of thoraxEExternal intercostal muscle

Developed by: