I think the correct answer from the choices listed above is option A. It is the alveoli that is composed of single layer <span>surrounded by a network of capillaries. These are used to allow oxygen and carbon dioxide to move from the lungs to the bloodstream.</span>
Answer:
Cornea
Explanation:
The first part of eye through which light enters into the eyes is cornea. Cornea comes in front of the pupil and iris and is made up of transparent layer. It is a curved structure just like a normal glass lenses and hence is able to focus light on retina. It also protects the eyes. Cornea along with anterior chamber is responsible for 67 percent of the optical power of eye and sends the light towards the pupil.
In this case, the unconditioned stimulus is; Chemotherapy.
Cancer are group of diseases caused by rapid growth of abnormal cells in the body. Chemotherapy is a treatment that involves the use of medications (anti-cancer drugs) to treat cancer. Chemotherapy causes various side-effects (as a result of the damage of normal cells of the body that rapidly increase). Nausea with vomiting, are common side effects that is usually experienced by cancer patients that are receiving chemotherapy.
Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
Molecule - they have a wide range of sizes and structures and perform a vast array of functions.
cell - consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids
tissue - an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function
population - same species that live in a particular geographic area at the same time
organ system - organs that work together as a biological system to perform one or more functions
ecosystem - community of living organisms in conjunction with the nonliving components of their environment
