Control Of Water And Ion Content Of The Body
Muhtasari
Drink a large glass of water and your bladder will remind you about it within the hour. Spend that same hour running about in the sun and it stays quiet. Nothing you did consciously produced either result. Two organs roughly the size of your clenched fist took the decision for you, sampling the blood that poured through them and adjusting, minute by minute, how much water they were willing to let go.
This lesson follows water, dissolved ions and waste nitrogen through the body. You will sort the routes that lose water without asking permission from the single route that is genuinely controlled, watch the liver convert a poison it has just made into something safe enough to carry in the blood, take a healthy kidney apart into its two jobs of filtering and reabsorbing, and finish with the hormone that decides whether the urine you produce today is pale and plentiful or dark and scarce.
Malengo
- Water leaves the body via the lungs when we breathe out and the skin when we sweat. Excess water is removed via the kidneys in the urine.
- Urea and ions are lost via the skin when we sweat. Excess ions are removed via the kidneys in the urine.
- In the liver: excess amino acids are deaminated to form ammonia, which is converted into urea for excretion; poisonous substances are detoxified, and the breakdown products are excreted in the urine via the kidneys; old blood cells are broken down and the iron is stored.
- In a healthy kidney: the blood is filtered; all the glucose is reabsorbed; the dissolved ions needed by the body are reabsorbed; as much water as the body needs is reabsorbed; urea, excess ions and excess water are released as urine.
- If the water content of the blood is too low, the pituitary gland releases a hormone called ADH into the blood. This causes the kidneys to reabsorb more water and results in a more concentrated urine.
- If the water content of the blood is too high, less ADH is released into the blood. Less water is reabsorbed in the kidneys, resulting in a more dilute urine.
- The production of ADH is controlled by a negative feedback mechanism.
Ramani ya mawazo
Mada hii imechorwa ili uone jinsi mawazo yanavyounganika.
Fungua ramani ya mawazo kwenye programu
Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Control Of Water And Ion Content Of The Body. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Which substance is filtered out of the blood in a healthy kidney but is absent from the urine that reaches the bladder? A. Water B. Urea C. Glucose D. Sodium ions Answer: C
- In which organ is ammonia converted into urea? A. The kidney B. The liver C. The bladder D. The pituitary gland Answer: B
- Which gland releases ADH into the blood? A. The pancreas B. The thyroid gland C. The pituitary gland D. The adrenal gland Answer: C
- The water content of a person's blood rises above its normal level. What happens next? A. More ADH is released and the urine becomes more concentrated B. Less ADH is released and the urine becomes more dilute C. More ADH is released and the urine becomes more dilute D. Less ADH is released and the urine becomes more concentrated Answer: B
- What happens during deamination? A. Glucose is converted into glycogen for storage B. The nitrogen-bearing group is removed from an amino acid the body cannot use C. Water is reabsorbed from the kidney tubule into the blood D. Old red blood cells are broken down and their iron is stored Answer: B
Fanyia kazi maswali haya kwenye programu
Fanyia kazi maswali haya kwenye programu
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Control Of Water And Ion Content Of The Body? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
