Circulatory System
Aperçu
Press a finger against the gum of a healthy goat and the pink returns almost at once. Do the same to a goat heavy with barber's pole worm and the gum stays pale, sometimes almost white, because there is barely enough blood left to colour it. That single check, used by herders across Nigeria long before it had a name, is a direct reading of the circulatory system: the blood, the heart that drives it, and the vessels that carry it to every living cell in the body.
In this lesson you will learn what blood is actually made of and what each component does, how the four-chambered heart works as a double pump, and why farm animals run a double circulation, one loop to the lungs and one loop to the body, rather than a single loop. You will finish able to read pale gums, a racing pulse or a bleeding wound the way an experienced stockman does: as signals from a system you now understand.
Objectifs
- Define the circulatory system
- Identify the components of blood
- State the functions of the heart
- Explain the pattern of blood circulation in a farm animal
- State the functions of the circulatory system
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Note de cours
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Évaluation de la leçon
Félicitations, vous avez terminé la leçon sur Circulatory System. Maintenant que vous avez exploré le concepts et idées clés, il est temps de mettre vos connaissances à lépreuve. Cette section propose une variété de pratiques des questions conçues pour renforcer votre compréhension et vous aider à évaluer votre compréhension de la matière.
Vous rencontrerez un mélange de types de questions, y compris des questions à choix multiple, des questions à réponse courte et des questions de rédaction. Chaque question est soigneusement conçue pour évaluer différents aspects de vos connaissances et de vos compétences en pensée critique.
Utilisez cette section d'évaluation comme une occasion de renforcer votre compréhension du sujet et d'identifier les domaines où vous pourriez avoir besoin d'étudier davantage. Ne soyez pas découragé par les défis que vous rencontrez ; considérez-les plutôt comme des opportunités de croissance et d'amélioration.
- Which component of blood is mainly responsible for carrying oxygen around the body? A. Plasma B. Red blood cells C. White blood cells D. Platelets Answer: B
- The chambers of the heart that receive blood returning to the heart are called the: A. Ventricles B. Valves C. Atria D. Arteries Answer: C
- The circulation of blood between the heart and the lungs is known as: A. Systemic circulation B. Pulmonary circulation C. Double circulation D. Portal circulation Answer: B
- Which blood component is chiefly responsible for clotting and stopping blood loss from a wound? A. Plasma B. Red blood cells C. White blood cells D. Platelets Answer: D
- A farm animal with pale gums, weakness and a raised heart rate is most likely suffering from: A. Overheating B. Anaemia C. Bloat D. Constipation Answer: B
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Questions de révision
Vous vous demandez à quoi ressemblent les questions passées sur ce sujet ? Voici plusieurs questions sur Circulatory System des années précédentes.
Question 1 Rapport
(a) State 6 activities that could be carried out in the brooding of chicks
(b) Explain each of the following management practices in poultry production
i. deworming
ii. culling
iii. debeaking
iv. delousing
(c) State four signs of ill health in poultry
(d) Mention to organs in the circulatory system of farm animals
Détails de la réponse
(a) Six activities carried out in the brooding of chicks
- Providing artificial heat/warmth for the chicks with a heat source (charcoal pot, electric bulb or gas brooder).
- Supplying clean, cool drinking water in shallow drinkers.
- Providing feed (chick starter/mash) in clean feeders.
- Spreading clean, dry litter/bedding on the floor and replacing wet litter.
- Providing adequate lighting and ventilation in the brooder house.
- Vaccinating and medicating the chicks and guarding them against predators and rodents.
(b) Management practices
- Deworming: the administration of anthelmintic drugs to animals to remove or destroy internal parasites (worms) living in the digestive tract, so as to improve health and productivity.
- Culling: the removal (and disposal) of unproductive, sick, deformed or unwanted birds from the flock so that only healthy, productive birds are kept.
- Debeaking: the trimming of part of the upper (and sometimes lower) beak of birds to prevent cannibalism, feather pecking, egg eating and feed wastage.
- Delousing: the treatment of birds with insecticides/pesticides to destroy external parasites such as lice and mites.
(c) Four signs of ill health in poultry
- Dullness and reduced activity, with the bird often isolating itself from the flock.
- Loss of appetite and reduced feed and water intake.
- Ruffled or rough feathers and a drooping appearance.
- Sudden drop in egg production, and diarrhoea with a soiled vent.
(d) Two organs of the circulatory system of farm animals
- The heart.
- The blood vessels (arteries, veins and capillaries).