Digestive System
Visão Geral
Put a pig and a goat in the same paddock in Jos and feed them nothing but dry maize stover for a week. The goat holds its condition. The pig loses weight fast. Both animals have a mouth, a stomach and intestines, so the difference cannot be that one eats and the other does not. The difference is what happens between the mouth and the intestine, and that is the whole subject of this lesson.
You will trace two digestive tracts organ by organ: the pig's simple, single-chambered system, and the cow or goat's four-compartment ruminant system. You will meet the rumen's population of microbes, the only workforce on the farm that can actually break down cellulose, and see exactly why a compound stomach turns rough, fibrous, cheap feed into meat and milk. Nearly every later topic on nutrition and feeding assumes you already know this system cold, so build it carefully now.
Objetivos
- Identify the parts of the digestive system of a monogastric animal
- Identify the parts of the digestive system of a ruminant animal
- Distinguish between the digestive system of a monogastric and a ruminant animal
- Explain the process of digestion in farm animals
- State the functions of the four compartments of the ruminant stomach
Mapa mental
Este tema esta mapeado para mostrar como as ideias se ligam.
Cartoes
Pratica rapida de memoria sobre o que e avaliado neste tema.
Nota de Aula
Registe-se para Continuar
Crie uma conta gratuita para aceder a todos os recursos de aprendizagem, perguntas práticas e acompanhar o seu progresso.
Avaliação da Lição
Parabéns por concluir a lição em Digestive System. Agora que você explorou o conceitos e ideias-chave, é hora de colocar seu conhecimento à prova. Esta seção oferece uma variedade de práticas perguntas destinadas a reforçar sua compreensão e ajudá-lo a avaliar sua compreensão do material.
Irá encontrar uma mistura de tipos de perguntas, incluindo perguntas de escolha múltipla, perguntas de resposta curta e perguntas de redação. Cada pergunta é cuidadosamente elaborada para avaliar diferentes aspetos do seu conhecimento e competências de pensamento crítico.
Use esta secção de avaliação como uma oportunidade para reforçar a tua compreensão do tema e identificar quaisquer áreas onde possas precisar de estudo adicional. Não te deixes desencorajar pelos desafios que encontrares; em vez disso, vê-os como oportunidades de crescimento e melhoria.
- Which of the following is the correct order in which feed passes through the compartments of a ruminant stomach? A. Reticulum, rumen, abomasum, omasum B. Rumen, reticulum, omasum, abomasum C. Omasum, reticulum, rumen, abomasum D. Rumen, omasum, reticulum, abomasum Answer: B
- The true, glandular stomach of a ruminant, which secretes hydrochloric acid and pepsin, is the: A. Rumen B. Reticulum C. Omasum D. Abomasum Answer: D
- The main compounds absorbed from the rumen as an energy source, produced by microbial fermentation of fibre, are called: A. Amino acids B. Volatile fatty acids C. Simple sugars D. Bile salts Answer: B
- Which organ in the pig performs a fermentation role broadly similar to, but much smaller than, the ruminant rumen? A. Duodenum B. Caecum C. Oesophagus D. Reticulum Answer: B
- The regurgitation and re-chewing of partly fermented feed by a ruminant is known as: A. Peristalsis B. Egestion C. Rumination D. Mastication Answer: C
Registe-se para Continuar
Crie uma conta gratuita para aceder a todos os recursos de aprendizagem, perguntas práticas e acompanhar o seu progresso.
Registe-se para Continuar
Crie uma conta gratuita para aceder a todos os recursos de aprendizagem, perguntas práticas e acompanhar o seu progresso.
Livros Recomendados
Para aprender mais, fontes abertas
-
Secção do manual
Digestive Systems
Explain the processes of digestion and absorption
"Biology: Digestive Systems" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/34-1-digestive-systems. Access for free at https://openstax.org/books/biology/pages/1-introduction
-
Secção do manual
Digestive System Processes
Describe the process of digestion
"Biology: Digestive System Processes" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/34-3-digestive-system-processes. Access for free at https://openstax.org/books/biology/pages/1-introduction
Publicados por outras organizações com licenças abertas e creditados como pedem. As ligações abrem os seus sites.
Questões de revisão
Pergunta-se como são as perguntas anteriores sobre este tópico? Aqui estão várias perguntas sobre Digestive System de anos passados.
Pergunta 1 Relatório
(a) State four ways in which livestock 1s important
(b)i. Mention sIx organs associated with the digestive system in rabbits.
(ii) State two functions of the alimentary canal in livestock
(c)i. State lour functions of the liver in farm animals
(ii) Mention two parasites that could be found in the liver of cattle
(d) State two differences between the digestive s systems of a goat and a rabbit
Detalhes da Resposta
(a) Four ways in which livestock is important
- Source of food such as meat, milk and eggs.
- Source of income and foreign exchange to the farmer and nation.
- Source of raw materials for industry (hides, skin, wool, bone).
- Source of organic manure for crop production, and of draught (work) power.
(b)(i) Six organs of the digestive system in rabbits
- Mouth
- Oesophagus
- Stomach
- Small intestine
- Caecum (large in the rabbit)
- Large intestine (rectum/anus)
(b)(ii) Two functions of the alimentary canal
- Digestion of food into simple absorbable forms.
- Absorption of digested nutrients into the blood, and egestion of undigested material.
(c)(i) Four functions of the liver
- Secretes bile which emulsifies fat during digestion.
- Stores glycogen, vitamins and minerals (e.g. iron).
- Detoxifies harmful/poisonous substances in the body.
- Deaminates excess amino acids and destroys worn-out red blood cells.
(c)(ii) Two parasites found in the liver of cattle
- Liver fluke (Fasciola species).
- Hydatid cyst (larva of the tapeworm Echinococcus).
(d) Two differences between the digestive systems of a goat and a rabbit
| Goat | Rabbit |
|---|---|
| Ruminant with a four-chambered stomach | Non-ruminant (monogastric) with a simple stomach |
| Digests cellulose mainly in the rumen and chews the cud | Digests cellulose mainly in the large caecum and practises coprophagy |
Registe-se para Continuar
Crie uma conta gratuita para aceder a todos os recursos de aprendizagem, perguntas práticas e acompanhar o seu progresso.