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Second Midterm 2012

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Animal Science
ANSC 2340
Linda Hunter

Exam: A University of Guelph Department of Animal & Poultry Science ANSC *2340 Structure and Function of Farm Animals Winter, 2012 Second Midterm Examination: March 13, 2012 Name (PRINT): Student Number: This examination has a total of 100 possible marks and is worth 25% of the final grade for the course. Please enter your name and ID number on both this examination paper and the computer card. Both must be handed in after the exam has been completed. There are 2 sections to this exam. Section 1 of the exam includes 32 multiple choice questions that are worth 2.5 marks for a total of 80 marks. Section 2 of the exam includes 5 short answer questions. This section is worth 20 marks in total. Answer all 37 questions. Also fill in the answer for thmultiple choice question that asks the version of the exam written based on the letter of the alphabet in the upper right hand corner on this page. You will have up to 1 hour and 20 minutes to complete this exam. 1 1) Identify the correct procedure(s) in the dressing of a carcass? a) Singeing precedes scalding. b) Evisceration starts from the anterior end of the carcass and proceeds to the posterior for all red meat species. c) The head is left on lambs. d) For the 4 species slaughter labs, a scalding procedure was only used in pigs. e) Fisting in sheep replaces hide removal in cattle. 2) Which of the following best describes organization of the neuron? a) Neuroglial cells transmit electrical impulses to the soma. b) An efferent neuron will transmit information to the brain. c) Saltatory conduction involves electrical impulses jumping from one Schwann cell to another. d) Axons conduct nerve impulses to the soma. e) Information transfer will be faster in myelinated versus unmyelinated nerve fibres. 3) Which of the following is true regarding stunning? a) This is the technique commonly used to kill the animal. b) Stunning of cattle is usually performed using carbon dioxide in North America. c) Captive bolt stunning is not used for market weight pigs. d) Stunning usually kills the animal but packing plants include exsanguination to ensure that death occurs. e) All red meat species (beef, pork, lamb) are usually stunned using captive bolt. 4) Which of the following statements is true regarding develop+2nt of rigor? a) Onset of the rapid phase is dependent on depletion of Ca in the muscle. b) Sarcomere length will decrease while permanent crossbridges will increase as the muscle develops full rigor. c) Muscle will be quite extensible during the final postrigor phase. d) Extensibility will be quite high while ATP is low during the delay period. e) ATP is being rapidly depleted in the delay period. 5) Which of the following is accurate regarding differences and similarities between the endocrine and nervous systems? a) The rate of response to the chemical message is rapid for both systems. b) The target tissues for both systems are identical. c) The respective messengers from both systems can travel long distances to cells and tissues all over the body. d) One system uses the synapse while the other uses the bloodstream for messenger delivery. e) While neurons are used to produce the chemical messenger in one system, only endocrine glands can be used to produce the chemical messenger in the other system. 2 6) The bones in the human hand between the wrist and knuckles correspond to these bones in cattle and sheep? a) Metacarpals or cannon bone. b) Metatarsals. c) Phalanges or cannon bone. d) Tarsals or cannon bone. e) Carpals or cannon bone. 7) Posture is maintained by this part of the brain: a) Pituitary. b) Cerebellum. c) Thalamus. d) Medulla oblongata. e) Cerebrum. 8) Identify thefalse statement about electrical stimulation of the carcass: a) Accelerates development of rigor mortis. b) Uses low voltage stimulation when processing carcasses entering the chill cooler. c) Enhances the activity of the calpain enzymes, the enzymes responsible for improvements in tenderness with postmortem ageing of the carcass or muscle cuts. d) Is never used on pork. e) Improves beef tenderness and flavour. 9) Which of the following is a proper procedure used in the dressing of a carcass? a) Removal of the cannon bone in pigs. b) Use of fisting in poultry. c) Removal of the oil glands from pigs. d) Removal of the kidneys before carcass weighing in sheep. e) Removal of the kidney fat in cattle. 10) Which of the following accurately describes brain function or location? a) The cerebellum is involved with learning, communication, and behavior. b) The hypothalamus is part of the brain stem. c) Thalamus provides sensory input information to the cerebellum. d) The brain stem is involved with regulating blood vessel diameter. e) The pons emerges out the foramen magnum as the spinal cord. 11) Which of the following accurately describes brain structures? a) The cerebral cortex is made up primarily of white matter from nerve fibers. b) Basal nuclei are directly underneath the cerebral cortex. c) White matter serves to connect the cerebral cortex to other parts of the brain and spinal cord. d) White matter refers to a layer of the brain made up primarily of nerve cell bodies. e) Gyri and sulci refer to shallow and deep grooves respectively on the brain surface. 3 12) What does muscle relaxation+2equire? a) Sequestering of Ca into the T tubules. b) Action of acetyl cholinesterase inhibitors at the myoneural junction. c) Breakdown of the troponin T- Ca +2 complex. d) Depolarization of the sarcolemma and T tubules. e) Adequate ATP for the action of the calcium pump in the sarcoplasmic reticulum. 13) Synaptic transmission involves: a) Only excitatory neurotransmitters. b) Chloride ions hyperpolarizing a postsynaptic membrane when an inhibitory neurotransmitter is involved. c) Only presynaptic and postsynaptic neurons. d) A neurotransmitter moving across the synaptic cleft to stimulate a presynaptic membrane. e) Epinephrine serving as an excitatory neurotransmitter to depolarize the sarcolemma. 14) Which of the following is +1ue regarding the nervous system? -1 a) The movement of Na ions out of the postsynaptic membrane and the movement of Cl enzymes into the postsynaptic membrane are responsible for hyperpolarization. b) Repolarization begins with Na ions leaving the axon. c) A postsynaptic neuron will only have one type of presynaptic neuron across the synaptic cleft. +1 d) The movement of Na ions into the axon will increase membrane potential to enable a nerve to fire. e) In saltatory conduction, unmyelinated nerve fibers help speed up transfer of the nerve impulse. 15) When examining the head, what are inspectors in a beef killing plant looking for evidence of? a) Taenia saginata. b) Echinococcus granulosus. c) Trichinella spiralis. d) Fasciola hepatica. e) Taenia solium. 16) How does curare affect the muscle contraction process? a) Acts to stimulate the break down of acetyl choline, b) Causes paralysis by blocking receptors on the sarcolemma c) Stimulates muscle contraction by blocking break down of acetyl cholinesterase. d) Causes paralysis by blocking release of acetyl choline from the end of the nerve fiber. e) Causes paralysis by blocking break down of acetyl cholinesterase inhibitors. 17) How does exsanguination affect muscle cell function? a) Immediately stops muscle function due to effects on the nervous system. b) Forces lactic acid to remain in the muscle fiber cell with resultant increases in pH. c) Increases activity of fast twitch fibers. d) Increases activity of slow twitch fibers. e) Immediately eliminates the use of creatine kinase to replenish ATP supplies. 4 18) What happens with a treppe contraction? a) It is an extension of unfused tetanus. +2 b) It occurs due to failure of the T tubules to sequester Ca . c) See a stair step effect for increases in force generated from increasing the strength of the stimulus. d) Due to increased binding of Ca +2 by Troponin-T. e) Relaxation will occur between stimuli. 19) Identify the false statement regarding characteristics of muscle? a) Red coloured muscles usually contain more white fibers than red fiber
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