BMD 252 Test 3 | Questions with Verified Answers Which layer of a blood vessel is primarily responsible for vasoconstriction and vasodilation? A) Tunica intima B) Tunica media C) Tunica externa D) Endothelium Which typ
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BMD 252 Test 3 | Questions with Verified Answers Which layer of a blood vessel is primarily responsible for vasoconstriction and vasodilation? A) Tunica intima B) Tunica media C) Tunica externa D) Endothelium Which type of artery acts as a pressure reservoir? A) Elastic artery B) Muscular artery C) Arteriole D) Capillary Capillaries are primarily involved in: A) Transporting blood to the heart B) Exchanging gases and nutrients C) Storing blood D) Regulating blood pressure Which type of blood vessel contains valves to prevent backflow? A) Arteries B) Capillaries C) Veins D) Arterioles What is the function of vascular anastomoses? A) To increase blood pressure B) To provide alternate pathways for blood flow C) To reduce blood viscosity D) To regulate blood volume Blood flow is directly proportional to: A) Blood pressure B) Blood viscosity C) Vessel length D) Vessel diameter In which type of blood vessel is blood pressure the lowest? A) Arteries B) Capillaries C) Veins D) Arterioles Which of the following factors does NOT influence blood pressure? A) Cardiac output B) Peripheral resistance C) Blood volume D) Heart rate Autoregulation of blood flow means: A) Hormonal regulation of blood volume B) Neural control of blood pressure C) Local regulation of blood flow based on tissue needs D) Systemic control of blood vessel diameter Bulk flow in capillaries involves: A) Diffusion of gases B) Active transport of ions C) Movement of fluid driven by pressure differences D) Osmosis Which of the following is NOT a function of the lymphatic system? A) Returning interstitial fluid to the bloodstream B) Transporting dietary fats C) Filtering blood D) Immune system activation Lymphatic capillaries are: A) Open-ended B) Found in the central nervous system C) More permeable than blood capillaries D) Absent in the digestive tract What is the role of the lymph nodes? A) Produce red blood cells B) Filter lymph and activate the immune system C) Store platelets D) Secrete hormones The spleen's primary function includes: A) Producing antibodies B) Cleansing blood and storing breakdown products of RBCs C) Filtering lymph D) Secreting bile MALT includes all of the following EXCEPT: A) Tonsils B) Peyer's patches C) Appendix D) Thymus The thymus is important for: A) Maturation of T lymphocytes B) Production of antibodies C) Filtration of blood D) Storage of red blood cells Which of the following is a first line of defense in the immune system? A) Phagocytes B) Natural killer cells C) Skin and mucous membranes D) Fever Natural killer cells: A) Phagocytize bacteria B) Attack virus-infected or cancerous cells C) Produce antibodies D) Secrete histamine Which inflammatory chemical is released by mast cells and basophils? A) Interferon B) Histamine C) Complement D) Lysozyme Which of the following is a function of complement proteins? A) Neutralize antigens B) Increase blood pressure C) Enhance inflammation and directly destroy bacteria D) Transport oxygen Antigens are: A) Cells that attack pathogens B) Substances that provoke an immune response C) Part of the innate immune system D) Hormones that regulate blood pressure Which cells mature in the thymus? A) B lymphocytes B) T lymphocytes C) Macrophages D) Dendritic cells Clonal selection of B cells results in the formation of: A) Plasma cells and memory cells B) T cells and macrophages C) Red blood cells and platelets D) Natural killer cells and neutrophils Which of the following is an example of passive immunity? A) Vaccination B) Infection C) Antibodies passed from mother to baby D) Production of memory cells The first antibody class to be released into the blood during an immune response is: A) IgG B) IgM C) IgA D) IgE The main function of the respiratory system is to: A) Transport nutrients B) Produce hormones
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