Homeostasis
Akopọ
Take a West African Dwarf goat out of its pen at six in the morning in Jos, when the Harmattan air is barely fifteen degrees, and again at two in the afternoon, when the sun over the same pen is fierce enough to make a herdsman sweat through his shirt. Measure the goat's own body temperature both times and it barely moves. The outside world swings wildly. The inside of the animal does not, and that quiet stability is not an accident: it is the animal's body actively fighting to hold its internal conditions steady, every second of the day.
In this lesson you will learn what homeostasis means, the general negative-feedback mechanism that every homeostatic correction follows, and how the nervous system and the endocrine system, the two systems you have already met, each play a distinct part in keeping the correction working. Body temperature will be your running example throughout, because thermoregulation is the homeostatic mechanism every stockman meets first and relies on to keep animals alive, growing and productive.
Awọn Afojusun
- Define homeostasis
- Explain the role of the nervous system in homeostasis
- Explain the role of the endocrine system in homeostasis
- Explain the importance of homeostasis to a farm animal
- Give examples of homeostatic mechanisms in farm animals
Akọ̀wé Ẹ̀kọ́
Forúkọsílẹ̀ láti Tẹ̀síwájú
Ṣẹda àkọọlẹ ọfẹ kan láti wọlé sí gbogbo àwọn oríṣìíríṣìí ìkànsí ikẹ́kọ̀ọ́, àwọn ìbéèrè ìdánwò, àti láti tọpa ìlọsíwájú rẹ.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Homeostasis. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Homeostasis is best defined as: A. Keeping every body condition permanently fixed at one value B. Maintaining a stable internal environment within a narrow normal range despite external change C. The process by which an animal grows larger over time D. The exchange of gases between an animal and its surroundings Answer: B
- Arrange in the correct order: (i) effector (ii) receptor (iii) control centre (iv) stimulus. A. iv, ii, iii, i B. ii, iv, i, iii C. iv, iii, ii, i D. i, ii, iii, iv Answer: A
- Which brain region acts as the body's thermostat, comparing body temperature against the normal range? A. Cerebellum B. Hypothalamus C. Spinal cord D. Adrenal medulla Answer: B
- Which of the following is a nervous, rather than a hormonal, response to a sudden rise in body temperature? A. A gradual fall in thyroxine output over several days B. Widening of skin blood vessels within seconds C. A rise in insulin output after a meal D. A slow rise in growth hormone over several weeks Answer: B
- The hormone chiefly responsible for the LONGER-TERM adjustment of metabolic rate during sustained cold weather is: A. Insulin B. Adrenaline C. Thyroxine D. Progesterone Answer: C
Forúkọsílẹ̀ láti Tẹ̀síwájú
Ṣẹda àkọọlẹ ọfẹ kan láti wọlé sí gbogbo àwọn oríṣìíríṣìí ìkànsí ikẹ́kọ̀ọ́, àwọn ìbéèrè ìdánwò, àti láti tọpa ìlọsíwájú rẹ.
Forúkọsílẹ̀ láti Tẹ̀síwájú
Ṣẹda àkọọlẹ ọfẹ kan láti wọlé sí gbogbo àwọn oríṣìíríṣìí ìkànsí ikẹ́kọ̀ọ́, àwọn ìbéèrè ìdánwò, àti láti tọpa ìlọsíwájú rẹ.
