What are 2 examples of a positive feedback mechanism?

Positive Feedback Loops

• Example 1: Fruit Ripening.
• Example 2: Childbirth.
• Example 3: Blood Clotting.
• Example 1: Temperature Regulation.
• Example 2: Blood Pressure Regulation (Baroreflex)
• Example 3: Osmoregulation.
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What muscles are used for defecation?

There are two major muscles the stool must pass through to exit the body, the internal sphincter muscle and the external sphincter muscle (4). The internal sphincter muscle is “involuntary”. It automatically relaxes and opens at the top of the anal canal to allow stool to pass through.

What is positive feedback in human physiology?

Positive feedback is known as a positive response or a self-reinforcing response to external or internal input. In this, the effector boosts up the stimulus that enhances the product formation for maintaining body stability. Positive feedback promotes a change in the physiological state instead of reversing it.

Which of the following is an example of positive feedback system?

A good example of positive feedback involves the amplification of labor contractions. The contractions are initiated as the baby moves into position, stretching the cervix beyond its normal position. The feedback increases the strength and frequency of the contractions until the baby is born.

Which of these are example of positive feedback?

An important example of positive feedback is the process of labor and childbirth. >Stimulus : A stimulus is something that disrupts the body’s homeostasis. An injury or an infection are examples of stimuli. They affect the normal processes in the body.

What stimulus initiates the defecation reflex?

As it becomes filled the rectal walls expand and stretch receptors stimulate the desire to defecate. The urge to defecate arises from contraction of rectal muscles, relaxation of the internal anal sphincter and an initial contraction of the external anal sphincter.

How does the pooping process work?

Humans expel feces with a frequency varying from a few times daily to a few times weekly. Waves of muscular contraction (known as peristalsis) in the walls of the colon move fecal matter through the digestive tract towards the rectum. Undigested food may also be expelled this way, in a process called egestion.

Why do positive feedback systems that are part of a normal physiological response include some mechanism that terminates the system?

Why do positive feedback systems that are part of a normal physiological response include some mechanism that terminates the system? Because positive feedback systems continually intensify or reinforce the original stimulus, some mechanism is needed to end the response.

Which of the following is an example of positive feedback to indirectly maintain homeostasis?

Which of the following is an example of positive feedback to indirectly maintain homeostasis? Q. When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding.

What is an example of a positive feedback mechanism in the menstrual cycle?

During ovulation, positive feedback causes a burst of FSH, LH, and estrogen. During the second half of the cycle, progesterone rises as the corpus luteum in the ovary matures and produces this hormone.

What is bowel reflex?

If the injury is located at T12 or higher, the bowel will empty by a reflex. It will be called a “reflex bowel.” This means that when the rectal vault is full of stool, it will increase the pressure and then stool will be pushed out.