التنسيق الغددي: الدم يحمل الرسالة
مُقدَّم| English | المعنى |
|---|---|
| target organ/ˈtɑːɡɪt ˈɔːɡən/ | العضو المستهدف |
| endocrine gland/ˈendəʊkraɪn ɡlænd/ | الغدة الصماء |
What would explain this observation?
- A hormone travels in blood, yet only suitable targets respond. Transport through the circulation is different from an electrical impulse along a neurone.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- The endocrine system consists of glands secreting chemical hormones directly into the bloodstream. Blood carries a hormone to a target organ 靶器官, where it produces an effect. Compared with nervous responses, hormonal effects are generally slower and last longer. The pituitary in the brain releases several hormones in response to body conditions; some stimulate other glands to release hormones.
- endocrine gland 内分泌腺: A gland releasing hormones directly into blood; target organ: An organ responding to a particular hormone.
أي مسار يصف التنسيق الهرموني؟
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هرمون يُفرز من غدة إلى الدم، الذي ينقله إلى عضو مستهدف - الغدة إلى الدم إلى العضو المستهدف. يصل الدم إلى جميع الخلايا، لكن فقط الخلايا ذات المستقبلات الملائمة تستجيب.
طابق كل مصطلح تقني مع معناه الدقيق.
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استخدم التعريفات للتمييز بين الكميات والعمليات ذات الصلة.
Choose evidence that can test it
- Locate the pituitary below the brain, thyroid in the neck, adrenal glands above the kidneys and pancreas in the abdomen. Ovaries lie in the pelvis and testes in the scrotum. These positions help identify glands on a body diagram; a gland’s position is not the location of every target it affects. The term master gland describes the pituitary’s coordinating role, not production of every hormone.
- Label a teacher-provided body outline, then trace gland → blood → target → effect for a supplied hormone. Contrast that route with receptor → nerve pathway → effector. Use model data only; classroom investigations must not involve administering hormones or collecting sensitive personal medical information.
أي عادة من العادتين تجعل التحقيق أو النموذج في هذه الحالة أكثر قابلية للدفاع؟
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توضيح الشروط والافتراضات يسمح للآخرين بتكرار العمل بدقة، وتسجيل الأدلة الداعمة يتيح لهم التحقق من الاستنتاج. إخفاء النتائج المتعارضة يزيل الأدلة التي قد تتحدى استنتاجًا خاطئًا، ولا يمكن لقياس واحد أن يثبت ادعاءً أوسع.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: in a fictional transport model, a stated messenger travels a 30 cm route in 6 seconds. Model mean transport speed = distance/time = 5 cm per second. This arithmetic concerns the supplied model, not a universal hormone response time. Transport, target detection and the resulting cellular response are separate stages.
A supplied model route is 42 cm and transport takes 7 s. Calculate mean transport speed. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
مسار نموذجي مُزَوَّد طوله 42 سم واستغرق النقل 7 ثانية. احسب متوسط سرعة النقل.
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النتيجة هي 6 cm/s. معطيات: المسار 42 cm؛ الوقت 7 s. استخدم السرعة = المسافة / الزمن. السرعة = 42/7 = 6 cm لكل ثانية. هذا عملية حسابية على النموذج المقدم، وليس وقت استجابة هرموني عالمي.
Check the conclusion and its limits
- The pancreas is a gland, while insulin is a hormone it produces. Blood distribution does not mean all cells respond identically. A hormonal response cannot be assigned a fixed universal speed from one fictional transport calculation.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
The pituitary produces every hormone in the body. This claim is false: The pituitary produces several important hormones, but many glands - thyroid, pancreas, adrenals, ovaries, testes - produce their own. No single gland produces every hormone.
Endocrine coordination: blood carries the message: Locate the pituitary below the brain, thyroid in the neck, adrenal glands above the kidneys and pancreas in the abdomen. Ovaries lie in the pelvis and testes in the scrotum. These positions help identify glands on a body diagram; a gland’s position is not the location of every target it affects. The term master gland describes the pituitary’s coordinating role, not production of every hormone.
غدة النخام تنتج جميع الهرمونات في الجسم.
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تنتج الغدة النخامية عدة هرمونات مهمة، لكن العديد من الغدد - الدرقية، البنكرياس، الكظرية، المبايض، الخصيتين - تنتج الخاصة بها. لا توجد غدة واحدة تنتج كل الهرمونات.
غدة تفرز الهرمونات مباشرة في الدم: اكتب المصطلح التقني.
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الغدة الصماء تعني غدة تفرز الهرمونات مباشرة في الدم.