Chapter 18, 19, 20 and 21

Inflammation is a response of the immune system to tissue damage or infection. It is characterized by redness, heat, swelling, and pain at the site of injury or infection. These symptoms are caused by increased blood flow to the affected area, as well as the release of inflammatory mediators. Inflammation is not specific to a particular pathogen and can be triggered by a variety of factors, including physical injury, infection, or autoimmune disorders.

The given blood pressure reading of 160/98 mm Hg indicates hypertension. Hypertension refers to high blood pressure, and a reading above 140/90 mm Hg is generally considered hypertensive. This reading suggests that the individual has elevated blood pressure levels, which may require medical attention or management to prevent potential health complications associated with hypertension.

HIV attacks the helper T cells, which are a crucial part of the immune system. By targeting and destroying these cells, HIV weakens the person's immune system, making them more vulnerable to various infections. This increased susceptibility to infection is one of the major consequences of HIV infection.

The descending aorta is located in the abdominal cavity. The aorta is the largest artery in the body and it carries oxygenated blood away from the heart to the rest of the body. It begins at the top of the left ventricle of the heart and descends down through the chest and abdomen. The descending aorta starts at the level of the diaphragm, which separates the chest cavity from the abdominal cavity, and continues down to the pelvis where it branches off into smaller arteries.

The pulse is usually "taken" over the radial artery. The radial artery is located on the inner side of the wrist, towards the thumb. It is easily accessible and commonly used to measure the pulse rate.

When capillary pore size increases in severe burns, it allows for increased capillary filtration of water. This increased filtration also leads to the filtration of albumin, which is then deposited in the tissue space. As a result, edema develops. Therefore, all of the statements mentioned above are true.

Leukocytosis refers to an increase in the number of white blood cells (WBCs) in the body. This can occur in response to various conditions, including infections, inflammation, and certain medications. When the WBCs are engaging in phagocytosis, it means that they are actively engulfing and destroying foreign particles, such as bacteria or viruses. This process is a crucial part of the immune response and can lead to an increase in WBC count. Therefore, leukocytosis can be an indication that the WBCs are actively involved in phagocytosis.

Lymphadenitis is the inflammation of lymph nodes, which are part of the body's immune system. It is commonly caused by an infection, such as a bacterial or viral infection. The infection leads to an immune response, causing the lymph nodes to become swollen and painful. Therefore, lymphadenitis is most often associated with an infection and can usually be treated by addressing the underlying infection. Drug treatment, such as antibiotics, is often prescribed to help clear the infection and reduce inflammation in the lymph nodes.

Helper T cells are a type of white blood cell that play a crucial role in the immune response. They do not produce pus, suppress inflammation, or secrete antibodies. Instead, helper T cells secrete a lymphokine, which is a signaling molecule, that stimulates the activity of B and T cells. This stimulation enhances the immune response, allowing the body to better fight off infections and diseases.

The iliac, femoral, and popliteal arteries are responsible for supplying blood and nutrients to the lower extremities. These arteries play a crucial role in maintaining the circulation of oxygenated blood to the legs and feet, ensuring proper nourishment and oxygen supply to the tissues in that region.

The primary concern regarding the care of a person experiencing an anaphylactic reaction is the inability to breathe. During an anaphylactic reaction, the airways can become constricted, leading to difficulty in breathing or even complete obstruction. This can result in a life-threatening situation if not promptly addressed. Therefore, ensuring that the person's airway remains open and providing immediate medical intervention, such as administering epinephrine, is crucial in managing an anaphylactic reaction.

Epinephrine (adrenaline) and angiotensin II are classified as vasopressors. Vasopressors are substances that constrict blood vessels and increase blood pressure. They work by stimulating the smooth muscles in the walls of blood vessels, causing them to narrow and reduce the diameter of the vessels. This constriction increases the resistance to blood flow and raises blood pressure. Epinephrine and angiotensin II are commonly used in medical settings to treat conditions such as severe hypotension or shock, where there is a critical need to increase blood pressure quickly.

The spleen is responsible for removing worn-out red blood cells (RBCs) and platelets from the circulation. It acts as a filter, breaking down and recycling these old cells. This function helps to maintain the overall health and quality of the blood.

The killer T cell is the correct answer because it is responsible for destroying the bacterium by punching holes in its cell membrane and by secreting lymphokines that enhance phagocytic activity. Killer T cells are a type of T cell that play a key role in the immune response by directly killing infected cells or cancer cells. They do this by releasing cytotoxic molecules that cause cell death and by activating other immune cells to help eliminate the threat.

Edema is the most likely complication to develop in a patient who has had a breast removal (mastectomy) and lymph node dissection. Edema refers to the swelling of body tissues due to the accumulation of fluid. After a mastectomy and lymph node dissection, there is a disruption in the lymphatic system, which can lead to the accumulation of fluid in the affected area. This can cause swelling, discomfort, and limited range of motion. Therefore, edema is a common complication following these procedures.

Plasma cells are specialized white blood cells that are derived from B cells. They play a crucial role in the immune response by producing and secreting antibodies. Antibodies are proteins that bind to specific foreign substances, such as bacteria or viruses, and help to neutralize or eliminate them from the body. Therefore, the correct answer is that plasma cells secrete antibodies.

The given answer states that the vertebral and carotid arteries deliver oxygenated blood to the brain. This is correct because these arteries are responsible for supplying blood to the brain. The carotid arteries, located in the neck, deliver oxygenated blood to the brain's anterior portion, while the vertebral arteries, situated in the spine, supply blood to the posterior part of the brain. Together, these arteries ensure that the brain receives a constant supply of oxygenated blood, which is essential for its proper functioning.

Antibodies are proteins produced by the immune system in response to the presence of antigens, which are foreign substances like viruses or bacteria. Their main function is to attach to these antigens and mark them for destruction by other immune cells. Therefore, antibodies attack antigens, helping to eliminate them from the body and prevent further infection or illness.

The given correct answer is "elevates blood pressure". A vasopressor is a medication or agent that constricts or narrows the blood vessels, leading to an increase in blood pressure. By causing vasoconstriction, the agent reduces the diameter of the blood vessels, which in turn increases the resistance to blood flow. This increased resistance causes an elevation in blood pressure. Therefore, a vasopressor is known for its ability to elevate blood pressure.

Lymph contains protein because protein leaks out of the capillaries into the tissue spaces and is then absorbed into the lymphatic capillaries. This process occurs due to the increased permeability of the capillaries, allowing proteins to escape into the surrounding tissues. The lymphatic capillaries then collect this protein-rich fluid along with other waste products and transport it back into the bloodstream.

The palatine tonsils are the tonsils most often removed surgically because they are the most commonly affected by infections and inflammation, such as tonsillitis. When the palatine tonsils become repeatedly infected or cause severe symptoms, surgical removal, known as a tonsillectomy, may be recommended as a treatment option. This procedure helps to alleviate symptoms and prevent recurrent infections.

Lymphatic capillaries are described as having large pores and following venous pathways. This means that they have openings that allow for the easy entry of interstitial fluid and other substances, and they generally run alongside veins. This allows them to collect excess fluid and waste products from the tissues and transport them back to the circulatory system.

Arterioles spend most of their time contracting and relaxing. This is because arterioles are responsible for regulating blood flow and blood pressure in the body. When arterioles contract, they constrict and narrow, reducing blood flow to the tissues. This helps to increase blood pressure. On the other hand, when arterioles relax, they dilate and widen, allowing for increased blood flow and lower blood pressure. This constant contracting and relaxing of arterioles helps to maintain the balance and control of blood flow throughout the body.

The tonsils are lymphoid organs located in the throat that play a crucial role in the immune system's defense against ingested or inhaled pathogens. They act as a first line of defense by trapping and filtering out bacteria, viruses, and other harmful substances that enter the body through the mouth or nose. The tonsils contain immune cells that help identify and neutralize these pathogens, preventing them from causing infections or spreading further in the body. Therefore, the tonsils are specifically designed to guard against ingested or inhaled pathogens.

Naturally acquired active immunity refers to the immunity that is developed when a person's own immune system produces antibodies in response to an infection or exposure to a pathogen. In this case, "getting the disease" as a child refers to the natural process of being infected with a disease, which triggers the immune system to produce antibodies and develop immunity against that specific disease. This type of immunity is long-lasting and provides protection against future infections.

Ischemia refers to a lack of blood supply to a particular area of the body, usually due to a blockage in the blood vessels. When there is ischemia, the affected area may experience pain, pallor (pale coloration), pulselessness (absence of pulse), paresthesia (tingling or numbness), and paralysis. This occurs because without adequate blood flow, the tissues do not receive enough oxygen and nutrients, leading to cell damage and dysfunction. Therefore, ischemia is the most likely cause of the symptoms described.

Veins are the correct answer because they are blood vessels that carry blood back to the heart from the body's organs and tissues. Veins have thin walls and contain valves that prevent the backflow of blood. They have a larger capacity to store blood compared to other blood vessels like arterioles, aorta, and capillaries. Therefore, the majority of the blood in the body is stored within the veins.

The correct answer is "part of the spleen". Adenoids are lymphoid organs located in the pharynx, specifically in the nasopharynx. They are a type of tonsils and are part of the immune system, helping to fight off infections. However, they are not a part of the spleen, which is a different organ located in the abdomen and involved in filtering blood and producing immune cells.

The subclavian veins receive lymph from the large lymphatic ducts, thereby returning lymph to the general circulation. This means that the subclavian veins play a role in the lymphatic system by receiving lymph, which is a fluid containing white blood cells and other waste products, from the large lymphatic ducts. The lymph is then returned to the general circulation, allowing it to be filtered and processed by the lymph nodes and other lymphatic organs before being reintroduced into the bloodstream.

Elephantiasis is caused by impaired lymphatic drainage. This condition occurs when the lymphatic system, which is responsible for draining excess fluid from tissues, is unable to function properly. As a result, fluid accumulates in the affected area, leading to swelling and enlargement of body parts, such as the limbs or genitals. Impaired lymphatic drainage can be caused by various factors, including parasitic infections, such as filariasis, or other conditions that damage the lymphatic vessels.

An overly active spleen can lead to a condition called hypersplenism, where the spleen removes platelets from the bloodstream at a faster rate than normal. Platelets are responsible for blood clotting, so when they are removed prematurely, it can result in a decreased platelet count and an increased risk of bleeding. Therefore, the correct answer is bleeding.

A decreased plasma oncotic pressure is caused by the loss of plasma protein such as albumin. Albumin is an important protein that helps maintain the oncotic pressure in the blood vessels. When there is a loss of albumin, either through kidney disease, liver disease, or other factors, the oncotic pressure decreases. This can lead to fluid shifting out of the blood vessels and into the surrounding tissues, causing edema. Therefore, the loss of plasma protein such as albumin is the most likely cause of decreased plasma oncotic pressure.

The umbilical vein carries oxygen-rich blood. This vein is responsible for transporting oxygen and nutrients from the placenta to the developing fetus during pregnancy. Once the blood reaches the fetus, it is then distributed throughout the body, providing oxygen and nutrients essential for growth and development.

Passive, immediate onset, and short-lived immunity is the least true or related to a vaccine. Vaccines provide active immunity, where the body's immune system is stimulated to produce its own antibodies and memory cells. This results in long-lasting immunity, as the body is prepared to fight off future infections. On the other hand, passive immunity is when pre-formed antibodies are given to an individual, providing immediate but temporary protection. Vaccines do not provide passive immunity, as they aim to stimulate the body's own immune response.

When digital pressure is exerted over the carotid sinus, it stimulates the baroreceptors located in the sinus. The baroreceptors send signals to the medulla oblongata, which is responsible for regulating blood pressure. In this case, the medulla oblongata interprets the signal as high blood pressure and activates the vagus nerve. The activation of the vagus nerve leads to a decrease in heart rate and a subsequent decrease in blood pressure, counteracting the initial increase caused by the pressure on the carotid sinus.

The event that occurs last in the baroreceptor reflex is reflex tachycardia. This is because reflex tachycardia is a response to the activation of the baroreceptors and the subsequent stimulation of the sympathetic nerves. When the baroreceptors detect a drop in blood pressure, they send signals to the brain, which then activates the sympathetic nervous system. This leads to an increase in heart rate, resulting in reflex tachycardia. Therefore, reflex tachycardia occurs as the final step in the baroreceptor reflex pathway.

Arterioles are small blood vessels that connect arteries to capillaries. They have the ability to contract and relax, which allows them to regulate blood flow and blood pressure. When arterioles constrict, they increase resistance to blood flow, which can help regulate blood pressure. This ability to function as resistance vessels is important in maintaining proper blood flow and distribution throughout the body. Therefore, the correct answer is that arterioles function as resistance vessels.

The tunica intima, tunica media, and tunica adventitia are the three layers that make up the walls of blood vessels. The tunica intima is the innermost layer, composed of endothelial cells that provide a smooth surface for blood flow. The tunica media is the middle layer, consisting of smooth muscle cells that control the diameter of the blood vessel and regulate blood pressure. The tunica adventitia is the outermost layer, made up of connective tissue that provides support and protection to the blood vessel. Together, these layers form the structure of blood vessels.

Lymph is formed from interstitial (tissue) fluid. Interstitial fluid is the fluid that surrounds the cells in tissues. It is formed when blood plasma filters out of the capillaries and into the spaces between cells. This fluid then enters the lymphatic vessels and becomes lymph. Lymph plays a crucial role in the immune system as it carries immune cells and substances throughout the body, helping to fight infections and remove waste products.

The correct answer is helper T cell. CD4+ T cells are a type of T lymphocyte that play a crucial role in the immune response by assisting other immune cells, such as B cells and cytotoxic T cells. They help regulate and coordinate the immune system's response to pathogens and are particularly important in the adaptive immune response. CD4+ T cells express the CD4 protein on their surface, which allows them to interact with other immune cells and recognize antigens presented by antigen-presenting cells.

The skeletal muscle pump, respiratory pump, and vasoconstriction all work together to assist in the return of blood to the right heart. The skeletal muscle pump refers to the contraction of muscles surrounding veins, which helps to push blood back towards the heart. The respiratory pump occurs during breathing, where changes in pressure within the thoracic cavity help to facilitate venous return. Vasoconstriction refers to the narrowing of blood vessels, which increases blood pressure and improves venous return. Collectively, these mechanisms aid in the movement of blood from the peripheral tissues back to the heart.

Baroreceptors are sensory receptors that are located in the carotid sinus and aortic arch. These receptors are responsible for sensing changes in blood pressure. When blood pressure increases, the baroreceptors send signals to the brain to decrease heart rate and dilate blood vessels, which helps to lower the blood pressure. Conversely, when blood pressure decreases, the baroreceptors send signals to increase heart rate and constrict blood vessels, which helps to raise the blood pressure back to normal levels. Therefore, the statement that baroreceptors are located in the carotid sinus and aortic arch and sense changes in blood pressure is correct.

A person with severe streptococcal pharyngitis (sore throat) is most likely to have painful cervical lymph nodes. This is because the streptococcal infection can cause inflammation and swelling of the lymph nodes in the neck, leading to pain and tenderness. Hypertrophied thymus gland, cervical lymphoma, and enlarged inguinal lymph nodes are not typically associated with streptococcal pharyngitis.

CN IX (glossopharyngeal nerve) and CN X (vagus nerve) are responsible for carrying sensory information from various organs to the central nervous system (CNS). These nerves play a crucial role in regulating autonomic functions. Both CN IX and CN X carry information related to changes in blood pressure to the CNS. This information helps the CNS in maintaining homeostasis by regulating blood pressure and ensuring adequate perfusion to different organs and tissues.

A booster shot stimulates memory cells to produce antibody-secreting plasma cells. Memory cells are a type of immune cell that "remember" previous encounters with a specific pathogen or antigen. When a booster shot is administered, it serves as a reminder to the memory cells, prompting them to produce more antibody-secreting plasma cells. These plasma cells then produce and release antibodies specific to the antigen targeted by the booster shot, enhancing the immune response and providing increased protection against the pathogen.

The ductus arteriosus is a blood vessel that connects the pulmonary artery to the aorta in a fetus. It allows blood to bypass the fetal lungs since they are not yet fully developed and not needed for oxygen exchange. Instead, the blood flows directly from the pulmonary artery to the aorta, supplying oxygenated blood to the rest of the fetal body. This redirection of blood helps to ensure that the developing fetus receives enough oxygen for its needs.

The umbilical vein carries oxygenated blood from the placenta to the fetus. During fetal development, the placenta acts as the organ of respiration, providing oxygen and nutrients to the fetus. The umbilical vein is responsible for transporting the oxygen-rich blood from the placenta to the developing fetus, ensuring its proper growth and development.

Sympathetic nerve stimulation typically leads to increased peripheral resistance, as it causes vasoconstriction of blood vessels. This vasoconstriction narrows the blood vessels, making it harder for blood to flow through them, resulting in increased resistance. However, the given answer states that sympathetic nerve stimulation does not cause decreased peripheral resistance. Therefore, the correct answer is that decreased peripheral resistance is not a consequence of sympathetic nerve stimulation.

Blood pressure is higher in the arteries than in the veins because arteries carry oxygenated blood away from the heart to the rest of the body, while veins carry deoxygenated blood back to the heart. The pressure in the arteries is higher because the heart pumps blood into them with force, while the veins rely on the contraction of surrounding muscles to push blood back to the heart.

A sudden elevation in blood pressure triggers a reflex response known as bradycardia, which is a decrease in heart rate. This response helps to counterbalance the increased blood pressure by reducing the heart's pumping rate. This reflex bradycardia helps to maintain a stable blood pressure and prevent further increases in blood pressure.