Answer:
B. decreases salivation and increases blood pressure
Explanation:
The sympathetic nervous system is part of the autonomous nervous system which controls involuntary responses of the body such as salivation and blood pressure.
The sympathetic nervous system is majorly responsible for body actions that are produced when threat is perceived. It generates responses referred to as the “fight or flight” response. Examples of such responses include, increased breathing, increased high blood pressure, dilation, decreased salivation, etc.
Activation of the sympathetic nervous system would result in rise in the blood pressure as can be witnessed by someone whose body has perceived a threat or reacting to a stressful situation.
The control of salivary production by the sympathetic nervous system leads to the release of noradrenaline which acts on certain receptors that results in decrease in the production of saliva. This is evident in a person that is facing a threat also.
Having a high surface area helps so yes in the human body villi is an example of a structure that increases surface area to increase absorption rates.
"Skeletal muscle, also called voluntary muscle, in vertebrates, most common of the three types of muscle in the body. Skeletal muscles are attached to bones by tendons, and they produce all the movements of body parts in relation to each other. Unlike smooth muscle and cardiac muscle, skeletal muscle is under voluntary control. Similar to cardiac muscle, however, skeletal muscle is striated; its long, thin, multinucleated fibres are crossed with a regular pattern of fine red and white lines, giving the muscle a distinctive appearance. Skeletal muscle fibres are bound together by connective tissue and communicate with nerves and blood vessels."
Britannica, The Editors of Encyclopaedia. "Skeletal muscle". Encyclopedia Britannica, 5 Jan. 2018, https://www.britannica.com/science/skeletal-muscle. Accessed 24 May 2021.
Explanation:
I am currently taking biology and the Britannica website has most definitely proven to be a reliable source!
Answer:
30, 000 plaques.
Explanation:
Plaques may be defined as the clear zones or spots that indicates the lysis of the bacteriophages. These plaques are useful to count the number of progeny phages.
The formula used to calculate the phage is as follows;
Plaques progeny = [Number of plaques observe/(Dilution factor x Volume of diluted virus)]
Since, in the given question the dilution factor and volume is not given and it can be taken as unity.
Plaques progeny = 30, 000 / ( 1 x 1)
Plaques progeny = 30, 000.
Thus, the answer is 30, 000.