All Free Veterinary Science MCQs with Answers

• A. Prolactin
• B. Cortisol
• C. Follicle-stimulating hormone
• D. Oxytocin

Explanation: Oxytocin from the posterior pituitary stimulates uterine smooth muscle contraction and also supports milk let-down.

• A. Atrioventricular valves
• B. Semilunar valves
• C. Pulmonary veins
• D. Aortic branches

Explanation: Ventricular systole starts with ventricular contraction, which raises pressure and closes the atrioventricular valves.

• A. Ligament
• B. Tendon
• C. Articular cartilage
• D. Joint capsule

Explanation: A tendon transmits the force of a skeletal muscle to its bony attachment.

• A. Ovarian medulla
• B. Graafian follicle
• C. Corpus luteum
• D. Germinal epithelium

Explanation: The corpus luteum develops from the ruptured follicle and secretes progesterone, which supports the uterine lining and pregnancy.

• A. Arteries
• B. Arterioles
• C. Venules
• D. Capillaries

Explanation: Capillaries have thin walls that permit diffusion and filtration between blood and surrounding tissues.

• A. Increased heart rate and contractility
• B. Decreased heart rate
• C. Complete atrioventricular block
• D. Reduced ventricular filling

Explanation: Sympathetic stimulation increases heart rate, conduction, and myocardial contractility, helping raise cardiac output during stress or…

• A. Right atrium
• B. Left atrium
• C. Right ventricle
• D. Left ventricle

Explanation: The left atrium receives oxygenated blood through the pulmonary veins and passes it to the left ventricle.

• A. Foramen ovale
• B. Ductus venosus
• C. Ductus arteriosus
• D. Umbilical vein

Explanation: The ductus arteriosus diverts fetal blood from the pulmonary trunk into the aorta because the fetal lungs are not yet functioning for gas…

• A. Lymphocyte
• B. Eosinophil
• C. Basophil
• D. Neutrophil

Explanation: Neutrophils rapidly migrate from blood into tissues during acute bacterial inflammation and engulf pathogens.

• A. The percentage of blood volume occupied by red cells
• B. The proportion of plasma proteins
• C. The concentration of haemoglobin in each red cell
• D. The total number of white cells in blood

Explanation: Hematocrit is the fraction or percentage of whole blood volume occupied by packed erythrocytes.

• A. Secretion of pancreatic enzymes
• B. Sorting of ingesta and initiation of cud regurgitation
• C. Absorption of most amino acids
• D. Production of bile salts

Explanation: The reticulum works with the rumen to sort ingesta and helps move suitable material back to the mouth for rumination.

• A. Zona glomerulosa
• B. Zona reticularis
• C. Zona fasciculata
• D. Adrenal medulla

Explanation: The zona fasciculata is the main cortical zone producing glucocorticoids such as cortisol.

• A. Chloride release from the axon
• B. Rapid potassium entry through ligand-gated channels
• C. Calcium removal from the synaptic cleft
• D. Rapid sodium entry through voltage-gated channels

Explanation: Depolarisation begins when voltage-gated sodium channels open and sodium enters the neuron down its electrochemical gradient.

• A. Oestrogen
• B. Progesterone
• C. Relaxin
• D. Oxytocin

Explanation: Oestrogen promotes female secondary sexual characteristics and contributes to reproductive tract development and behavioural changes…

• A. Peripheral vasoconstriction
• B. Peripheral vasodilation
• C. Reduced respiratory movement
• D. Increased skeletal muscle shivering

Explanation: Peripheral vasodilation increases blood flow to the skin, allowing more heat to leave the body by radiation and convection.

• A. Duodenum
• B. Jejunum
• C. Caecum
• D. Oesophagus

Explanation: The equine caecum contains a large microbial population that ferments fibre and produces volatile fatty acids for absorption.

• A. A rise in hypothalamic temperature set point
• B. A fall in hypothalamic temperature set point
• C. A permanent loss of heat production
• D. A complete stoppage of sweating

Explanation: During fever, pyrogens raise the hypothalamic set point, so the animal responds as if its current temperature is too low.

• A. Reduced skin tent duration
• B. Sunken eyes and dry mucous membranes
• C. Increased rumen contractions
• D. Cool moist muzzle with normal pulse

Explanation: Sunken eyes and dry mucous membranes are common clinical indicators of moderate dehydration in cattle.

• A. Simple indigestion
• B. Vagal indigestion
• C. Ruminal acidosis
• D. Primary ketosis

Explanation: Rapid grain intake increases fermentation of starch and production of lactic acid, causing ruminal acidosis.

• A. Creatinine
• B. Uric acid
• C. Bilirubin
• D. Acetoacetate

Explanation: Acetoacetate is a ketone body that can be detected in urine during bovine ketosis.