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Section 6

Review Questions from Section 6

In maintaining internal body temperature, what role does the hypothalamus play? it serves as a thermostat
In maintaining internal body temperature, the _______________ in the skin act as radiators. blood vessels
In order to lower internal body temperature, do the blood vessels in the skin widen or narrow? widen
In what layer of the skin are the sweat glands found - the dermis or the epidermis? the dermis
How does sweat aid the body in cooling down? a) it acts as a seal, blocking heat from external sources b) it draws heat from the body as it evaporates c) it lubricates the hairs on the skin, making them weatherproof it draws heat from the body as it evaporates
In order to help the body stay warm, do the blood vessels in the skin widen or narrow? they narrow or contract
In what layer of the skin are hair follicles found? a) dermis b) epidermis c) both dermis and epidermis both- they extend from the epidermis (top layer) down into the dermis
What substance do the sweat glands use to produce salty sweat? blood plasma
In hairy mammals (i.e.- not humans), the hair muscles contract in cold weather, causing the hairs to spring up and forming what to help trap heat? an insulating layer of air
A type of cell division used for growth and repair that results in the production of two new cells, each with identical chromosomes mitosis
A structural protein found in the epidermis, hair, and nails that makes those structures tough and waterproof keratin
When blood vessels in the skin are torn and bleeding, what is the body's first step in repairing the damage? blood platelets swell and become spiky, creating a plug to slow the flow of blood
A type of defense cell found in connective tissues that detects damage, pathogens, or foreign substances and triggers an inflammatory response by releasing histamine and other substances mast cell
When mast cells release chemicals following damage to the body, which two types of white blood cells are activated to seek out and destroy bacteria? neutrophils and monocytes
In fighting damage to the body, monocytes are transformed into bigger and hungrier cells called what? macrophages
What type of bodily response is essential for pathogen destruction and tissue repair? inflammatory response
Which system of the body is responsible for draining and returning excess tissue fluid to the bloodstream? the lymphatic system
The lymph capillaries weave their way between what two parts of the body? blood capillaries and tissue cells
Once excess fluid is trapped within the lymph capillaries, it becomes a watery mix of plasma proteins, white blood cells, and debris known as what? lymph
Which of the following is not a component of lymph? a) plasma proteins b) red blood cells c) white blood cells d) debris red blood cells
What mechanism is used to prevent backflow in the lymph vessels of the body? valves (like those in veins)
The two main priorities of the lymph system are ____________ and ______________. drainage and defense
What part of the lymphatic system empties lymph into the left and right subclavian veins? trunks
The trunks of the lymphatic system empty lymph into the left and right what? subclavian veins
What component is found in the lymph vessels that filters lymph and removes bacteria and any other dangerous substances? lymph nodes
What component of the lymph system is responsible for the proliferation of lymphocytes? the lymph nodes
What is the name of the bean-shaped swelling in a lymph vessel that contains immune system cells and removes pathogens and debris from lymph? lymph nodes
Which two types of cells engulf invading bacteria cells and display the bacterial antigens on their own surface? B cells and dendritic cells
Which type of cell helps coordinate the body's immune response? helper T cell
A helper T cell binds with what other type of cell to fight off a bacterial infection? activated B cell
When an activated B cell and a helper T cell have joined forces, the B cell divides and produces what two things to help fight a bacterial infection? plasma cells and memory B cells
The plasma cells produced by an activated B cell churn out thousands of __________________ each second to help fight a bacterial infection. antibody molecules
Which type of body invader makes copies of itself while hiding inside the body's own cells- bacteria or virus? virus
Which type of cell is required to destroy a virus? Killer T Cells
If a cell is infected with a virus, where will it display some of the virus antigens? on its cell membrane
True or false - a killer T cell can wipe out infected cells on its own without first getting a signal from a helper T cell False. It can't take any action until it gets the signal from a helper T cell
When fighting a virus, what does a helper T cell bind with in order to be "switched on" a macrophage displaying virus antigens on its surface
What is the substance released by Killer T cells that bores channels into an infected cell's membrane, allowing water to rush in which causes the infected cell to break apart and die? perforin
What type of cell will destroy any infected cell in the body? Natural Killer Cells (NK cells)
Created by: St Rita SD
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