Bio 256 Exam 3 ISU (Latest Complete Exam) Questions and Answers (GRADED A).

Bio 256 Exam 3 ISU (Latest Complete Exam) Questions and Answers (GRADED A). Which of the following are composed of myosin thick filaments The functional unit of skeletal muscle is a sarcomere An elaborate network of membrane in skeletal muscle cells that functions in calcium storage is the sarcoplasmic reticulum a motor unit is a motor neuron and myofibers it stimulates the neurotransmitter used at a motor end plate is acetylcholine The warm-up period required of athletes in order to bring their muscles to peak performance is called ________. treppe In an isotonic contraction, the muscle ________. changes in length and moves the "load" which of the following periods is when muscle is temporarily unable to respond to stimuli refractory period We have an expert-written solution to this problem! Glucose delivered to a recovering myofiber is used to reestablish glycogen stores smooth muscle is significantly different from striated muscle in several ways. Which of the following is true smooth muscle can shorten and stretch more than striated muscle which of the following is a regulatory function of blood maintenance of normal pH in body tissues which of these is NOT a normal plasma protein hemoglobin the function of hemoglobin is to carry oxygen place the following in the correct developmental sequence proerythroblast, late erythroblast, normo, reticul when red blood cells wear out, the iron of hemoglobin is saved and recycles. the remainder of the heme is excreted as bile pigments which of the following is a precursor of a lymphocyte lymphoblast the normal lymphocyte percentage of white blood cells is about 25% Cancer of lymphoblasts developing quickly in a young child would be called acute lumphocytic leukemia An individual who is blood type AB negative can ________. can receive any blood type in moderate amounts except those with Rh antigen the cardiac muscle contraction occurs when Ca++ enters the myofibers through slow channels cardiac ischemia can result in myocardial infarction During a normal cardiac cycle, the atria contract when they are directly stimulated by the sinoatrial node which of the following is NOT part of the conduction system of the heart atrioventricular valve if the vagus nerve to the heart were cut, the result would be the heart rate would increase by about 25 beats per minutes assuming each EKG is recorded for the same time period, which indicates a junctional rhythm? C On an EKG, depolarization of the ventricles is represented by the QRS complex The first heart sound (lub of lub-dub) is caused by the closure of the mitral and tricupsid valves The tricupsid valve is closed when the right ventricle is in systole which is the most important factor affecting stroke volume preload on average, normal resting cardiac output for an adult is about 5 liters/min angina pectoris pain accompanying myocardial ischemia skeletal muscle assists the heart in moving blood through veins The diameter of blood vessels most directly affects resistance which is the best defintion of blood pressure force per unit area... when you go from sitting to lying down... baroreceptor reflex Which will increase blood pressure? norepinephrine what causes the sounds heard in an artery when blood pressure is measured turbulence which is a risk factor for essential hypertension obesity blood flow to a tissue increases if vasodilation increases which is a condition that may cause transient hypertension exercising Exercising returns more blood to the heart. Therefore, exercising causes __ stroke volume and ___ heart contraction force. increased, increased ___ binds Ca++, exposing ____ binding sites on ____ Troponin, myosin, actin which of the following are composed of actin thin filaments which of the following surronds a bundle of myofibers perimysium each muscle fiber is stimlated by a nerve ending known as a motor end plate after nervous stimulation of the muscle cell has ceased, the acetylcholine is destroyed by acetyl choline esterase oxygen is stored in myofibers on myoglobin the blood vessel type removing carbon dioxide and wastes from the tissues is the vein If a doctor orders a blood test requiring the use of serum, no anticoagulant.. oxygen is transported by red blood cells, it is carried by attaching to the iron in heme place the following in the correct developmental sequence proerthroblast, late erthro, normoblast, reticulocyte All of the following can be expected with polycythemia except ________. low blood viscosity which of the following is a precursor of a eosinophil myeloblast which of the following is a characteristic of all leukocytes they are nucleated if cardiac muscle is deprived of its normal blood supply, damage would primarily result from lack of oxygen in myofibers where is the pacemaker of the heart located right atrium damage to the ___ is referred to as heart block atrioventriclar node norepinephrine acts on heart muscle cells by causing threshold to be reached more quickly An extended P-Q interval on an EKG usually indicates a blockage in the conduction system normal heart sounds are caused by which of the following events closure of the heart valves the frank-starling law of the heart states... false negative chronotropic factors are factors that decrease heart rate the effect of endurance-type atheltic training may be to lower the resting heart rate..... is caused by hypertrophy of the heart muscle mechanisms that do NOT help autoregulate blood pressure include liver synthesis of albumin blood protein what is the correct equation... BP= CO x PR which of the following chemicals does NOT control blood pressure nitric acid which will increase blood pressure antiduretic hormone which is NOT a possible results of chronic hypertension obesity if plasma protiens are lost due to kidney disease.... blood colloid osmotic pressure decreases Heguy became excited when he saw Shegal, so he developed ___. However, Shegal found Heguy boring, so she developed ___. tachycardia, bradycardia A muscle cell undergoing treppe is exhibiting ___ summation temporal A sacromere is the area between two Z discs which of the following wraps an entire muscle fascicle which of the following are composed of myosin thick filaments Muscle cells work together in groups known as motor units. These consist for a motor neuron and the muscle fibers innervated the neurotransmitter used at a motor end plate is acetylcholine in muscle action potential, the wave of positive mV charge travels through ___ to the sarcoplasm from the sarcolemma t-tubules the number of muslce fibers in a contracted state in an otherwise relaxed muscle is known as its muscle tone Glucose delivered to a recovering myofiber is used to bind to regulatory sites on troponin, changing the configuration red blood cells do not consume any of the oxygen they transport because they do not have a mitochondira which of the following might trigger erythropoiesis increased tissue demand of oxygen if a person has hepatitis, the liver.... bilirubin which would be associated with prematurely ruptured erthrocytes hemolytic anemia a person with chronic leukemia is ___ likely... more the father is Rh- and the mother is Rh+... never was problem which is the correct sequence of events in a cardiac myocardial action potential Na+ inward, Ca++ inward, K+ outward a heart beat is normally initiated when enough K+ ... which component of the intrinsic autorythmicity system of the heart functions to assure that... atrioventricular node the p wave of a normal electrocardiogram indicates atrial depoarization the first heart sound is caused by the ventricular filling during the period of ventricular filling blood flows from... the stroke volume for a normal resting heart is ___ 70 if acetylcholine is applied to the heart, but cardiac output is to remain constant... stroke volume must increase which of following does not influence heart rate skin color Blood by-passing a capillary bed flows through its metarteriole peripheral resistance increases as blood viscosity increases which provides a long term control for blood pressure blood volume Which is NOT a risk factor for essential hypertension? circulatory shock poor nutrition may lead to chronic hypotension rigor mortis occurs because atp required... muscle tone is a state of sustained... A sustained and frequent muscles stimulus brings about tetanus the blood vessel type bringing oxygen and nutrients TO.. artery you obtain a tube of blood from a patient. EDTA.... plasma which of the following it NOT required for ertyhropoiessis production of vacuoles when old red blood cells are worm out, their componenets are recycled. the globin from the hemoglobin is metabolized as amino acids sickling of red blood cells... travel at high altitudes normal precentage of white blood cells above 50% Input from the sympathetic nervous system causes the heart rate to increase normal ekg has small bumb, then spike, then a little bigger bumps(4 total) (A?) during the period of ventricular filling blood flows... not one of the three main factors influencing blood pressure.. emotional state acute hypotension may be the result of large scale blood loss the lubb heart sound occurs with the __ valves closing.... dub sound ___ atrioventricular, semilunar to lift a 50lb barbell ... isotonic, isometric