Answer:
Sympathetic nervous system
Explanation:
Under stress conditions, the sympathetic division of the autonomic nervous system prepares the body by exhibiting flight or fight response. It includes some physiological changes in the body during stress conditions such as before and during exams.
Some of the physiological responses of the sympathetic nervous system are rapidly pounding, dilated pupils of eyes, deep breathing, dry mouth, and sweaty skin. It also shunts the blood circulation towards active skeletal and cardiac muscles. Dilation of bronchioles to increase ventilation to facilitate the delivery of more oxygen to the body cell is another change stimulated by the sympathetic nervous system. Therefore, the mentioned responses are due to the activation of the sympathetic nervous system of the student since he is in the stress of the exam.
A motor neuron transmits the effect of a nerve impulse to the muscle fiber at epimysium and perimysium. Epimysium surrounds the muscle and it has rich in fiber elastic tissues. While perimysium is full of muscle fibers or it is a bundle of these tissues.
Answer:Cell membranes do not make nutrients (or energy) for the cells. This is the function of the mitochondria by the electron transport
Explanation:
Systematic observation, measurements and experiment and the formulation .testing.and modification of hypothesis
The thymus is the only lymphoid organ that does not D. fight the antigens directly.
- The thymus, bone marrow, spleen,lymph nodes, a network of lymphoid tissue along secretory surface (MALT), and the skin which performs the immune functions are known as lymphoid organs.
- On the basis of its role, lymphoid organ are classified into primary and secondary lymphoid organ.
- The lymphocytes from bone marrow are transformed into specialised T cells in the thymus. In this way thymus helps to improve the immune system
- T cells produced in the thymus is travels through the blood stream to lymphnodes and other parts of the body to fight against the antigen.
Learn more about Thymus on brainly.com/question/8565109
#SPJ4
