Wait a second!
More handpicked essays just for you.
More handpicked essays just for you.
Human reproductive system
Human reproductive system
Human reproduction systems, essays
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Recommended: Human reproductive system
Case Study 1: Feedback Loops
What is a feedback loop?
A feedback loop maintains homeostasis by keeping variables within particular limits. They consist of a stimulus that produces a change in a variable where the change is then detected by a receptor. The receptor sends the information along an afferent pathway to a control centre where it decides how to react. The information is then output from the control center and sent along an efferent pathway to an effector. The effector creates a response to the stimulus and returns variable to homeostasis. (Homeostasis: positive/negative feedback mechanisms 2013)
What are the two sorts of feedback loops and how are they different?
The two sorts of feedback loops are negative feedback loops and positive feedback loops. Positive feedback loops are an amplification and are instant, but not sustained. They are about moving away from a target set point and occur when your body needs something done instantly. Usually, only one stimulus is needed to trigger. An example of a positive feedback loop would be contractions during childbirth. The
…show more content…
FSH and LH start development of the follicle. After around 12 days the level of estrogen peaks. The high estrogen level has a positive feedback loop, which fuels the release of FSH and LH. The increase in LH causes the follicle to rupture, and the follicle cells that remain grow into the corpus luteum. When the follicle is mature, progesterone levels rise to stimulate the growth of the uterine lining in preparation for a fertilised egg. Progesterone has a negative feedback loop with the hypothalamus that inhibits GnRH, as well as FSH and LH. If there is no fertilisation, the levels of progesterone drop. This causes corpus luteum starts to shrink, endometrium breakdown, and menstruation begins. (The Ovarian And Menstrual Cycle 2013) (Hormones of the Reproductive System
This cycle tends to last anywhere from five to seven years and is shorter for hair on the eyebrows, armpits and pubic area. Inside the bulb of each hair is a component called the dermal papilla which controls the hair growth while the matrix of the hair, which contains a large amount of epidermal cells that rapidly divide, is responsible for the length of the hair. Next is the catagen phase which is characterized as a transition period between the anagen and telogen phases. At this time the hair bulbs are pushed out in order to become keratinized and the hair appears short and thick. This phase tends to only last between two and three weeks. During the telogen phase, no new cell division occurs, which means that the length of the hair remains the same. This pause allows the dermal papilla to fill up the matrix with new cells in preparation for the anagen phase to begin again. This phase can last between three and nine months. After this phase, the anagen phase begins again. The telogen phase is periodically followed by shedding, or exogen. This leads to the last phase, the exogen phase. This phase is characterized by the shedding of hair. Each day about one hundred hairs are shed from the average individual’s scalp. The shaft of the hair is shed and the follicle remains. Despite the fat that the exogen phase usually follows the telogen phase, there are exceptions when it does not, resulting in hair follicles needing to go
HCG which tells the body that it has produced to much ooestrogen. The body counteracts
Homeostasis is the biological process that maintains a stable internal environment despite what occurs in the external environment. Chemicals and bodily functions are maintained in a balanced state so the body may function optimally. There are various systems in the human body that require maintenance through the processes of biochemical checks and balances so they may function properly. One of these systems includes the rise and fall of blood glucose and is under the control of the homeostatic regulation process. Homeostasis is essential in blood glucose regulation as high blood glucose levels (hyperglycaemia) and low blood glucose levels (hypoglycaemia) are dangerous and can affect the human body in many ways and can also lead
Estrus synchronization is the practice of regulating when one or many mares will be in estrus. Breeders can follow certain protocol in order to cause synchronization in the cycle. According to Samper (2009), there are three methods of inducing estrus. These are induction of luteolysis, prevention of estrus using progestins and progesterone with estradiol which allow natural luteolysis to occur and are almost always combined with a treatment for ovulation induction, and follicular ablation. This paper with examine and explore the hormones, methods, doses and protocols used to synchronize estrus in the mare.
Positive reinforcement works by presenting something positive to the person after a desired behavior is exhibited, making the behavior more likely to happen in the future (McAdams, 2009). An example of this could be when a child helps their mother with the dishes and the mothers rewards the child with ice cream. Negative reinforcement, is when a behavior is strengthened by stopping, removing or avoiding a negative outcome or aversive stimulus (McAdams, 2009). An example of this could be when the light goes green at a traffic light, the car in front of a person does not move. The person hates when this happens and from experience knows that honking the car’s horn gets cars that are in front of them to go
should go through and if it doesn’t then the women has an irregular cycle. This process the movement of an egg to a fertilizing position, developing a lining in the uterus, then the shedding of that lining when the egg doesn’t become fertilized.
Homeostasis mostly works through negative feedback, this is where the effectors response lessens the effects of the original stimulu...
the ovaries to release an egg once a month but in some cases they release more
The female reproductive systems is made of 9 parts. The sex cell for the female reproductive system is called the egg or ovum. The egg spends it’s dormant life in the ovaries until it is released. The egg has 23 chromosomes within it. The ovaries have two goals: to create and house eggs and the release the female sex hormones, estrogen and progesterone. The fallopian tubes are what the egg travels through to reach the uterus. Fallopian tubes contain tiny hair-like structures called cilia; the cilia allows for mobility of the egg. The fallopian tube is roughly the size of 2 hairs, and is the site of where ectopic pregnancies happen. The process of the egg getting released from the ovaries through the fallopian tubes is called ovulation. Ovulation happens on the 14th day of the menstruation cycle The uterus is where the egg goes to after it travels through the fallopian tubes. The developing baby is held and nourished in the uterus. When the uterus is empty, it’s roughly the size of a fist but expands one an embryo starts to develop. The endometrium is the lining of the uterine wall. It’s used to protect the fetus. When the egg isn’t fertilized, menstruation ha...
begin to increase. Estrogen is what makes the lining of the uterus grow and get thicker. The
5) Follicle stimulating hormone (FSH) which is responsible for the stimulation of follicle cells found in the gonads. This encourages either the testes to produce sperm and the ovaries to produce ova.
Lastly, blood is involved in maintaining homeostasis by negative feedback loops such as temperature regulation, blood pH, blood glucose levels, and blood pressure.
Q.1 Cyclic Innovation Model has four processes cycles. These processes cycles will lead to entrepreneur. W.L. Gore & Associates using these processes cycles to illustrate the innovation process.
In general, a stimulus is that evokes a physiological response in an organism. In terms of this theory the stimuli are certain external events that will alter or change the behavior of a person. Rewarding stimuli are connected with ones wants, likes and the need of satisfaction. This acts as a positive reinforcer. However reinforcement only occurs if there is a significant change in one’s behavior. A stimulus can cause either a positive reinforcement or a negative one. Positive reinforcer can be some stimuli event for which one works in order that they may gain it.