Answer: Adrenal cortex
Explanation:
The adrenal cortex which is the outer part of the gland produces some hormones which is life saving hormones or vital hormones.
Two of those hormones are aldosterone and cortisol. Cortisol helps in the metabolism and helps the body to respond to stress in a balanced way.
The aldolsterone helps in the maintaining the blood pressure of the body. It is a type of mineralocorticoid which is produced by the zona glomerulosa of the adrenal cortex.
The correct answer is Oral region.
Submental region is the head region located on the area under the chin. This means that laceration of this region will most likely affect the oral region that is beneath submental region. Oral region includes facial area comprising lips and mouth.
Alternating sugar and phosphate molecules also 4 types of nitrogen bases
Answer:
The correct answers: A, B, C.
Explanation:
- Lipid bilayer is made of two layers of phospholipids, where each phospholipid molecule is made up of a glycerol which is attached to a phosphate group and two fatty acid chains by ester bonds.
- The phosphate groups being hydrophilic are directed towards the outside of the bilayer. The fatty acid chains (saturated or unsaturated) being hydrophobic are directed towards the inside of the bilayer.
- These fatty acid chains are not static and are capable of moving laterally in the bilayer, giving the bilayer the characteristics of fluidity.
- The fluidity is mainly provided by the presence of unsaturated (with one or multiple double bonds) fatty acid. The presence of double bonds results in the fatty acid molecules to have a bent shape and this increases the area occupied by each such unsaturated fatty acid molecule. The free area available allows the lateral movement of the fatty acid molecules.
- According to option A, long chain fatty acids tend to occupy more space within the lipid bilayer. This reduces the free space available for the movement of the lipid molecules.
- According to option B, saturated fatty acids are those which lacks any double bonds and the carbon atoms are attached by single bonds. Therefore, these molecules are straight in shape and occupy maximum area in the lipid bilayer. This reduces the space available for the free movement of fatty acid molecules, thereby making the membrane less fluid in nature.
- According to option C, cholesterol is a type of lipid molecule. They remain interspersed in between lipid molecules. At high temperatures, they prevent the lipid molecules from getting excessively fluid by filling in the gaps in between the lipid molecules and at very low temperatures they prevent the stiffening of the lipid molecules by getting associated with each other. At room temperature, they stabilise the lipid molecules between whom they remain interspersed and also reduce the free space in between them thereby reducing the lateral movement. This way they reduce the fluidity.
Answer:
B. axon hillock
Explanation:
The axon hillock is the junction where the cyton connects with the axon. There is only one axon hillock in the neuron and it is a triangular depression of cell boy to the axon. The axons receives impulse from cyton carry to the different parts of the body. The axon hillock is also called initial segment. Because action potential starts here.
Myelin sheath is the cover or layer around the axon and helps in saltatory movement of impulse. The propagation of impulse is fast in myelinated neurons than the non-myelinated neurons.
The neurolemma is the neural membrane of the neurons. It is like the plasma membrane of the cell. The outer covering of neurons is called neurilemma.
Axon collateral is the end of the axon where axon terminals arise. They carry impulse and transmit to the synapse.
