All Free Veterinary Science MCQs with Answers

• A. It stores concentrated bile
• B. It empties bile into the rumen
• C. It produces bile after feeding
• D. It is absent and bile flows continuously

Explanation: The horse lacks a gallbladder, so bile produced by the liver enters the small intestine continuously.

• A. Beta cells of the islets
• B. Alpha cells of the islets
• C. Acinar cells of the pancreas
• D. Delta cells of the islets

Explanation: Beta cells in the pancreatic islets release insulin, which promotes cellular glucose uptake and lowers blood glucose.

• A. Calcitonin
• B. Thyroxine
• C. Parathyroid hormone
• D. Aldosterone

Explanation: Thyroid follicular cells synthesize thyroxine, or T4, and triiodothyronine, or T3, which regulate metabolic activity.

• A. A continuous plate of hyaline cartilage
• B. Direct fusion of the opposing bones
• C. A joint cavity containing synovial fluid
• D. A fixed connection by dense bone

Explanation: A synovial joint has a fluid-filled joint cavity enclosed by a capsule and lined by synovial membrane.

• A. Meningeal dura mater
• B. Arachnoid granulations
• C. Cerebral cortex
• D. Choroid plexus

Explanation: The choroid plexus within the brain ventricles produces most cerebrospinal fluid through specialized vascular epithelium.

• A. They act as bellows for airflow
• B. They perform most oxygen diffusion
• C. They filter nitrogen from air
• D. They secrete pulmonary surfactant

Explanation: Avian air sacs function mainly as bellows that move air through the rigid lungs and help ventilate them.

• A. Duodenum
• B. Jejunum
• C. Ileum
• D. Cecum

Explanation: The jejunum has extensive mucosal folds, villi, and microvilli and is the principal site for absorption of many digested nutrients.

• A. Ventricular depolarization
• B. Atrial repolarization
• C. Atrial depolarization
• D. Ventricular repolarization

Explanation: The P wave represents the spread of electrical excitation through the atrial myocardium, causing atrial depolarization.

• A. Initiating atrial contraction
• B. Closing the semilunar valves
• C. Producing ventricular repolarization
• D. Delaying conduction to ventricles

Explanation: The atrioventricular node briefly delays the electrical impulse before it passes to the ventricles.

• A. Osteoblast
• B. Osteocyte
• C. Osteoclast
• D. Chondrocyte

Explanation: Osteoblasts synthesize osteoid and support its mineralization during bone formation.

• A. Grinding hard feed
• B. Temporary storage of feed
• C. Absorbing bile salts
• D. Producing digestive enzymes

Explanation: The crop is an enlargement of the oesophagus that temporarily stores and moistens ingested feed.

• A. Pepsin
• B. Insulin
• C. Bile
• D. Surfactant

Explanation: Hepatocytes produce bile, which contains bile acids, pigments, cholesterol, and other components that support fat digestion and excretion.

• A. Doe
• B. Bitch
• C. Queen
• D. Mare

Explanation: The mare has an epitheliochorial placenta, in which the maternal uterine epithelium remains in contact with the chorionic epithelium.

• A. Uric acid
• B. Ammonia
• C. Urea
• D. Creatinine

Explanation: Birds are mainly uricotelic and excrete nitrogen chiefly as uric acid, which conserves water and is eliminated as a semisolid component of…

• A. Phosphate buffer
• B. Bicarbonate buffer
• C. Protein-free buffer
• D. Ammonium buffer

Explanation: The carbonic acid and bicarbonate system is the major extracellular buffer of blood, and its components are regulated by the lungs and…

• A. Otolith organs
• B. Cochlear hair cells
• C. Semicircular canal receptors
• D. Retinal photoreceptors

Explanation: Hair cells in the cristae of the semicircular ducts detect angular acceleration in the vestibular system.

• A. Chief cell
• B. Enteroendocrine cell
• C. Goblet cell
• D. Parietal cell

Explanation: Parietal cells of the gastric glands secrete hydrochloric acid, which creates the acidic environment needed for protein digestion and…

• A. Cerebellum
• B. Cerebral cortex
• C. Medulla oblongata
• D. Hypothalamus

Explanation: The cerebellum coordinates the timing and precision of voluntary movements and contributes to posture and balance.

• A. Producing digestive enzymes
• B. Storing and filtering blood
• C. Secreting thyroid hormones
• D. Absorbing intestinal glucose

Explanation: The spleen filters blood, removes aged erythrocytes, participates in immune responses, and can store blood in some species.

• A. Distal convoluted tubule
• B. Thick ascending limb
• C. Proximal convoluted tubule
• D. Cortical collecting duct

Explanation: The proximal convoluted tubule reabsorbs large amounts of water along with solutes, so it has high baseline water permeability.