4. State the function of the following:-(Any three function of each],
a) Cerebrum
b) Glomerulus
c) Myelin sheath
d) Chloroplast .
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CEREBRUM:-The largest part of the brain, the cerebrum initiates and coordinates movement and regulates temperature. Other areas of the cerebrum enable speech, judgment, thinking and reasoning, problem-solving, emotions and learning. Other functions relate to vision, hearing, touch and other senses.
GLOMERULUS:-The main function of the glomerulus is to filter plasma to produce glomerular filtrate, which passes down the length of the nephron tubule to form urine.
MYELIN SHEATH:- The main functions of the myelin sheath are:
It acts as an electrical insulator for the neurone - it prevents electrical impulses travelling through the sheath.
The sheath prevents the movement of ions into or out of the neurone/ it prevents depolarisation.
It speeds up conduction/ transmission of an electrical impulse in the neurone - impulses cannot travel through the sheath (the sheath acts as an electrical insulator), instead, impulses 'jump' from a gap in the myelin sheath to another gap (it jumps from one Node of Ranvier to another Node). This is a process called Saltatory Conduction.
CHLOROPLAST:-Chloroplasts found in higher plants are generally biconvex or planoconvex shaped. Chloroplasts are the site of photosynthesis in eukaryotic cells. They are only present in photosynthetic cells like plant cells and algae. There are no chloroplasts in animal or bacterial cells.
GLOMERULUS:-The main function of the glomerulus is to filter plasma to produce glomerular filtrate, which passes down the length of the nephron tubule to form urine.
MYELIN SHEATH:- The main functions of the myelin sheath are:
It acts as an electrical insulator for the neurone - it prevents electrical impulses travelling through the sheath.
The sheath prevents the movement of ions into or out of the neurone/ it prevents depolarisation.
It speeds up conduction/ transmission of an electrical impulse in the neurone - impulses cannot travel through the sheath (the sheath acts as an electrical insulator), instead, impulses 'jump' from a gap in the myelin sheath to another gap (it jumps from one Node of Ranvier to another Node). This is a process called Saltatory Conduction.
CHLOROPLAST:-Chloroplasts found in higher plants are generally biconvex or planoconvex shaped. Chloroplasts are the site of photosynthesis in eukaryotic cells. They are only present in photosynthetic cells like plant cells and algae. There are no chloroplasts in animal or bacterial cells.
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