Human Digestive and Circulatory Systems Quiz
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Questions and Answers

What is the primary function of the liver in the digestive system?

  • To absorb nutrients from food
  • To store bile for future use
  • To produce enzymes for digestion
  • To produce bile and break down fats (correct)

    • Which function is NOT performed by the pancreas?

  • Producing insulin and glucagon
  • Regulating blood sugar levels
  • Producing digestive enzymes
  • Releasing bile into the duodenum (correct)

    • What role does the duodenum play in digestion?

  • Stores bile produced by the liver
  • Main site for absorption of water and electrolytes
  • Receives food and triggers hormone release (correct)
  • Mechanical digestion of food

    • What happens to blood sugar levels after eating?

    <p>Insulin causes glucose to move into the cells for energy (A)</p> Signup and view all the answers

    Which structure is primarily responsible for the absorption of nutrients?

    <p>Small intestine (D)</p> Signup and view all the answers

    What is the main function of the Sinoatrial Node (SA)?

    <p>Maintains the intrinsic pumping rhythm of the heart. (A)</p> Signup and view all the answers

    Which part of the heart does the pulmonary circuit utilize?

    <p>Right ventricle (C), Right atrium (D)</p> Signup and view all the answers

    What is the purpose of the delay at the Atrioventricular Node (AV)?

    <p>To enable the atria to contract before the ventricles. (B)</p> Signup and view all the answers

    Which valves must blood pass through when moving from the right atrium to the right ventricle?

    <p>Tricuspid valve (A)</p> Signup and view all the answers

    What characterizes the systemic circuit in terms of pressure?

    <p>It is a high-pressure system. (A)</p> Signup and view all the answers

    What is the function of the superior vena cava?

    <p>Carries deoxygenated blood from the upper body to the heart. (A)</p> Signup and view all the answers

    Which structure controls blood flow between the left atrium and left ventricle?

    <p>Bicuspid/Mitral Valve (A)</p> Signup and view all the answers

    What carries oxygenated blood from the lungs to the heart?

    <p>Left Pulmonary Veins (D)</p> Signup and view all the answers

    Which valve regulates blood flow from the right ventricle to the pulmonary trunk?

    <p>Pulmonary Semilunar Valve (D)</p> Signup and view all the answers

    What is the primary function of the left ventricle?

    <p>Pumps oxygenated blood to the body. (A)</p> Signup and view all the answers

    What is the blood pressure during diastole?

    <p>80 mmHg (C)</p> Signup and view all the answers

    During which phase of the cardiac cycle do the mitral and tricuspid valves close?

    <p>Systole (C)</p> Signup and view all the answers

    Which heart sound is produced by the closure of the pulmonary and aortic semilunar valves?

    <p>DUB (C)</p> Signup and view all the answers

    During which part of the cardiac cycle do the atria fill with blood?

    <p>Diastole (B)</p> Signup and view all the answers

    What is considered normal blood pressure?

    <p>140/90 mmHg (A)</p> Signup and view all the answers

    What is the primary function of red blood cells?

    <p>Transport oxygen to body cells (C)</p> Signup and view all the answers

    Which type of blood cell is responsible for clotting?

    <p>Platelets (D)</p> Signup and view all the answers

    Which statement accurately describes veins?

    <p>Veins contain valves to support blood flow (B)</p> Signup and view all the answers

    What percentage of blood mass is made up by white blood cells?

    <p>1% (A)</p> Signup and view all the answers

    What is the main function of blood plasma?

    <p>Carrying proteins and dissolved substances (A)</p> Signup and view all the answers

    What role do capillaries play in the circulatory system?

    <p>Connect the arterial and venous systems (B)</p> Signup and view all the answers

    Which of the following is true about arteries?

    <p>They have thick, muscular walls (B)</p> Signup and view all the answers

    What common feature is shared by alveoli, capillaries, and villi?

    <p>They all increase surface area for specific functions (C)</p> Signup and view all the answers

    What is the primary function of the alveoli?

    <p>Gas exchange (C)</p> Signup and view all the answers

    Which of the following structures directly carries air to the lungs?

    <p>Bronchi (B)</p> Signup and view all the answers

    What role do intercostal muscles play in respiration?

    <p>Expanding and contracting the chest cavity (C)</p> Signup and view all the answers

    Why do alveoli have thin walls?

    <p>To facilitate rapid gas diffusion (C)</p> Signup and view all the answers

    What is the function of the diaphragm during inhalation?

    <p>Contracts to pull air into the lungs (C)</p> Signup and view all the answers

    What is the primary function of the bronchi in the respiratory system?

    <p>Carry air from the trachea to the lungs (A)</p> Signup and view all the answers

    During inhalation, what action do the intercostal muscles take?

    <p>They move up and out (D)</p> Signup and view all the answers

    Which of the following is NOT a role of the nasal and oral cavities in respiration?

    <p>Gas exchange with alveoli (B)</p> Signup and view all the answers

    What causes air to move into the lungs during inhalation?

    <p>Decreased pressure in the thoracic cavity (B)</p> Signup and view all the answers

    What is the main process by which carbon dioxide is expelled from the thoracic cavity during exhalation?

    <p>Higher pressure within the thoracic cavity (C)</p> Signup and view all the answers

    What part of the brain is primarily responsible for the regulation of breathing?

    <p>Medulla oblongata (C)</p> Signup and view all the answers

    How do increased levels of $CO_2$ and $H^+$ influence breathing rate?

    <p>They cause respiratory muscle contraction and increase breathing rate. (A)</p> Signup and view all the answers

    What occurs to the concentration of $CO_2$ in the blood during interrupted breathing?

    <p>It decreases due to forced expulsion. (A)</p> Signup and view all the answers

    What type of respiration refers to the gas exchange between alveoli and blood?

    <p>External respiration (A)</p> Signup and view all the answers

    What is the primary focus of internal respiration?

    <p>Gas exchange between blood and body cells (A)</p> Signup and view all the answers

    What is the primary function of the liver in digestion?

    <p>Produces bile to assist in fat digestion (C)</p> Signup and view all the answers

    Which part of the digestive system is responsible for the absorption of water from undigested food?

    <p>Large intestine (D)</p> Signup and view all the answers

    Where does the first part of chemical digestion take place?

    <p>Small intestine (C)</p> Signup and view all the answers

    Which organ stores and concentrates bile?

    <p>Gallbladder (A)</p> Signup and view all the answers

    What is the main role of the rectum in the digestive system?

    <p>Stores waste material before elimination (D)</p> Signup and view all the answers

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