Lecture Quiz 3: Homeostasis

How does the effector restore homeostasis in a negative feedback loop? -The effector opposes the initial stimulus and shuts off when conditions return to the normal range. -The effector increases and reinforces the initial stimulus. -The effector amplifies the response, but does not continue indefinitely. -The effector causes a rapid change in a variable.

The effector opposes the initial stimulus and shuts off when conditions return to the normal range.

A mother breastfeeds her infant. As long as the baby suckles his mother's breast, the mother's mammary glands produce milk. Suckling, the stimulus, increases milk production, the response. This scenario is best described as: a positive feedback loop. principle of complementarity of structure and function. anatomical position. a negative feedback loop.

a positive feedback loop.

A cell or organ that responds to the directions of the control center in a negative feedback loop is termed a(n): receptor. regulator. stimulus. effector.

effector

What part of a feedback loop causes physiological responses to return the variable to the normal homeostatic range? -receptor (sensor) -control center -stimulus -effector

effector

The maintenance of a relatively constant internal environment is termed: -homeostasis. -integration. -positive feedback. -effector control.

homeostasis

When you go outside on a hot summer day, your body temperature heats up above the normal range. Receptors in your brain detect the change in body temperature. The brain activates nerve cells that send messages to sweat glands, causing the body temperature to fall as the sweat evaporates from the skin. What part of this feedback loop is the stimulus? increased body temperature sweat glands nerve cells brain

increased body temperature

The type of feedback that increases or enhances the effects of the variable is: neutral. responsive. positive. negative.

positive

Part complete When you go outside on a hot summer day, your body temperature heats up above the normal range. Receptors in your brain detect the change in body temperature. The brain activates nerve cells that send messages to sweat glands, causing the body temperature to fall as the sweat evaporates from the skin. What part of this feedback loop is the effector? -nerve cells -sweat glands -increased body temperature -brain

sweat glands