Exam 1: Introduction to Physiology and Homeostasis

Which of the following statements applies to extracellular fluid?

Stem cells are not common to all multicellular organisms.

All stem cells are found in the umbilical cord.

The ____________________ system eliminates waste products other than carbon dioxide, and plays a key role in regulating the volume, electrolyte composition, and acidity of the extracellular fluid.

The ____________________ system controls and coordinates bodily activities that require swift responses, especially to changes in the external environment.

Tissues are composed of two or more types of cells organized to perform a particular function or functions.

All proteins are enzymes.

Match the components labelled a. through d. with their correct role.Temperature-sensitive nerve cells monitor the body temperature and provide information about its status to a temperature-control centre in the hypothalamus, a part of the brain. The hypothalamus can bring about adjustments in body temperature by inducing shivering or sweating, among other things. a.controlled variable b.integrator c.sensor d.effector -hypothalamus

Most homeostatic mechanisms operate on the principle of positive feedback.

The external environment is found outside cells but inside the body.

What are the two systems concerned with the control of body functioning by extrinsic controls?

Match the terms labelled a. through d. with their correct descriptions. (Options may be used more than once or not at all.) a.nervous tissue b.epithelial tissue c.muscle tissue d.connective tissue -This tissue type is composed of cells specialized for contraction.

Which one of these pairs is correctly matched?

Sweating is initiated in response to a rise in body temperature that occurs on exposure to a hot environment. Evaporation of the sweat cools the body. What kind of example is this?

Muscle cells produce movement by expanding.

A mechanistic explanation of why a person sweats is to cool off.