Choose the Correct Option of Following Anatomy,physiology Human Body Flashcards

It is important for any organism to maintain its boundaries, so that its internal environment remains distinct from the external environment surrounding it

• true
• false

Responsiveness or irritability is the ability to sense changes in the environment and then respond to them

• true
• false

Lungs carry out an excretory function.

• true
• false

Generally what is the result of the negative feedback process?

• to keep the body's blood sugar level high

• to maintain homeostasis

• to control body movement

• to regulate excretion via the kidneys

• Positive feedback differs from negative feedback because

• • positive feedback is critical to health while negative feedback serves only to alert us to potential health threats

• positive feedback provides moment-to-moment wellbeing while negative feedback causes a cascade effect

• positive feedback tends to enhance the triggering stimulus while negative feedback tends to return the body to a homeostatic balance or "ideal" level

• positive feedback is generally beneficial while negative feedback is typically harmful

When a baby suckles at its mother's breast the stimulus at the breast is sent to the mother's brain (a region called the hypothalamus). The brain responds by releasing hormones to stimulate the production and the ejection of milk from the breast. This helps the newborn to receive nourishment and encourages more suckling. This example is best described as a ________.

• necessary life function

• negative feedback

• positive feedback

• loss of homeostasis

Some of the nerve endings in the skin are sensitive to changes in temperature. They are part of a negative feedback mechanism regulating body temperature. These nerve endings represent a(n) ________ in the negative feedback mechanism.

• effector

• control center

• homeostatic balance or "ideal" value

• receptor

A good example of a positive feedback mechanism would be ________.

• blood calcium level regulation

• regulating glucose levels in the blood

• body temperature regulation

• enhancement of labor contractions

• Homeostasis is the condition in which the body maintains ________.

• a relatively stable internal environment, within limits

• a dynamic state within an unlimited range, depending on circumstances

• the lowest possible energy usage

• a static state with no deviation from preset points

Which of the following statements is the most correct regarding homeostatic imbalance?

• It is considered the cause of most diseases.

• Positive feedback mechanisms are overwhelmed.

• The internal environment is becoming more stable.

• Negative feedback mechanisms are functioning normally.