consists of mutual sharing of one or more pair of electron between two atoms. These electron are simultaneouly attracted by the two atomic nuclei, A covalent bond forms when the differences between the electronegative of two atom is too small for an electron transfer to occur to form lons.
Blood flow reduces when its flow resistance is expanded. Total peripheral resistance is characterized as total blood flow resistance in the systemic circulation. Because of their smaller size and muscle walls the arterioles are effective regulators of blood flow.
Peripheral resistance is the artery's resistance to blood flow. As the arteries restrict the resistance increases and the resistance decreases when they dilate. Three factors influencing peripheral resistance are :
- Autonomous activity: a sympathetic activity which blocks peripheral arteries.
- Pharmacological agents: the vasoconstrictor drugs raise resistance while it is reduced by vasodilator drugs.
- Viscosity of the blood: Higher viscosity enhances resistance.
Explanation:
<h3><em><u>keep the body running smoothly, a continuous concentration of 60 to 100 mg/dL of glucose in blood plasma is needed. During exercise or stress the body needs a higher concentration because muscles require glucose for energy (Basu et al., 2009).</u></em></h3>
Answer:
The correct answer will be option-B
Explanation:
The data collected on the bacterial species in the Yellowstone national park involved:
1. habitat characteristics
2.DNA of bacteria from each population
3. compared with other species of the park
Based on these features, the biologist could apply all the types of species concept like ecological species concept which allows the study of the species from the same niche.
Also, they compared the DNA of the species of the bacteria and compared them which allows to trace the evolutionary patterns and showing the phylogenetic relationship.
Since bacteria do not reproduce by the sexual reproduction, therefore, a biologist cannot apply the biological species concept which states that species can be called species which can reproduce only with the closely rated species only or the individual of the same species.
Thus, Option-B is the correct answer.
An engineering cycle is meant to assess the environmental impacts in relation to economic impacts on a product. The assessment is the whole life cycle of a product consisting of production, use phase and end of life. It's important because it helps mold the standard of living for generations to come and be sustained indefinitely. It protects against negative environmental factors but also reduces the cost of production for business', also.
