By Rob Seeley, Philip Tate, Trent D. Stephens
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Additional info for Anatomy and Physiology
Near the end of pregnancy, the baby’s larger size stretches the uterus. This stretching, especially around the opening of the uterus, stimulates contractions of the uterine muscles. The uterine contractions push the baby against the opening of the uterus and stretch it further. This stimulates additional contractions, which result in additional stretching. This positive-feedback sequence ends only when the baby is delivered from the uterus and the stretching stimulus is eliminated. Normal range Constantly increasing value outside of the normal range Homeostasis is not maintained.
Why did Molly faint? c. How did Molly’s fainting and falling to the floor assist in establishing homeostasis (assuming she was not injured)? indd 10 Explain how negative-feedback mechanisms control respiratory rates when a person is at rest and when a person is exercising. Positive Feedback Positive-feedback responses are not homeostatic and are rare in healthy individuals. 8). Positive feedback therefore usually creates a cycle that leads away from homeostasis and, in some cases, results in death.
A median plane divides the body into equal right and left halves. ■ A transverse (horizontal) plane divides the body into superior and inferior portions. ■ A frontal (coronal) plane divides the body into anterior and posterior parts. 2. Sections of an organ ■ A longitudinal section of an organ divides it along the long axis. ■ A cross (transverse) section cuts at a right angle to the long axis of an organ. ■ An oblique section cuts across the long axis of an organ at an angle other than a right angle.