Differences And Components Of Mitosis And Meiosis

1.

A. Homeostasis is the ability for the body to maintain a stable internal environment, despite changes that can occur in external conditions.

A typical feedback loops has three main components that make it function. 1) Receptor, which regulates changes in a controlled environment and sends information to the control center. 2) Control Center, which compares incoming input with other information and informs the effector, for a change to occur. 3) Effector, acts on the changes and releases the response.

B. Many physiological processes are controlled by feedback mechanisms. A Negative feedback occurs when the rate of a process drops as the concentration rises. Positive Feedback occurs when the rate of a process increases and as the concentration

3. Mitosis and Meiosis both have their similarities and differences. Some of the differences are that in mitosis, it occurs in somatic cells in the body and in meiosis only in sexual reproduction cells. In mitosis, dividing cells can be diploid or haploid, and in meiosis dividing cells are diploid only. In mitosis, DNA replicates once during the S phase of interphase and nucleus divides once. During meiosis, same replication occurs but there are two successive nuclear divisions.

Both meiosis and mitosis have multistage processes in their cell division. They both have diploid parent cells. During metaphase, pairs of chromatids line up along the equator. During anaphase, the sister chromatids in both processes are separated to opposite poles. Both processes end with cytokinesis.

4. A. The Fluid Mosaic Model state that membranes are composed of Phospholipid Bilayer that contains protein molecules which float within it. The fluid part represents how certain parts of the membrane can move around freely, if they are not attached to any substances. The mosaic part, contains the group of proteins that are found in the phospholipid bilayer. The membrane contains proteins that can span the bilayer (intrinsic) and others are partly embedded in the bilayer

Long term memory stores information for a long period of time, which is kept permanently in the brain. It has a large storage capacity and retrieving information generally takes longer. Short term memory informs the mind of information for a short period of time given capacity limits and involves quick retrievals from the brain, such as remembering an address. Short term memory generally has a duration of seconds to hours versus long term memory has a duration for days to years.

10A. In the body, sympathetic preganglionic neurons are very short, by communicating with the cell bodies of postganglionic neurons that are very long, it helps create a smoother transmission. These postganglion neurons are created in the ganglion chain.

Thus, leading to the sympathetic preganglionic neurons to connect with postganglionic neurons at the sympathetic ganglion outside of the central nervous system.

B. The sympathetic division has more widespread and long lasting effects than the parasympathetic division because of the fight or flight mechanism. This mechanism prepares the body how to respond to stress. How it is our body’s primitive duty to prepare us for a threat or attack. Parasympathetic is different, it is responsible for the rest and digest mechanism. This method is known for slowing activities that are enhanced by the sympathetic