AP Tissue Organization Chapter 4

What are the functions of astrocytes?

Astrocytes regulate ions and uptake and/or breakdown of some neurotransmitters and contribute to the formation of the blood-brain-barrier.

Aspirin is a non-steroidal anti-inflammatory drug (NSAID) that inhibits the formation of blood clots and is taken regularly by individuals with a heart condition. Steroids such as cortisol are used to control some autoimmune diseases and severe arthritis by down-regulating the inflammatory response. After reading the role of inflammation in the body's response to infection, can you predict an undesirable consequence of taking anti-inflammatory drugs on a regular basis?

Since NSAIDs or other anti-inflammatory drugs inhibit the formation of blood clots, regular and prolonged use of the drugs my promote internal bleeding , such as bleeding in the stomach. Excessive levels of cortisol would suppress inflammation, which could slow the wound healing process.

In looking through a microscope how could you distinguish skeletal muscle tissue from smooth muscle?

Skeletal muscle cells are striated.

What is the function of synovial membranes?

Synovial membranes are a type of connective tissue membrane that supports mobility in joints. The membrane lines the joint cavity and contains fibroblasts that produce hyaluronan, which leads to the production of synovial fluid, a natural lubricant that enables the bones of a joint to move freely against one another.

You are watching cells in a dish spontaneously contract. They are all contracting at different rates; some fast, some slow. After a while, several cells link up and they begin contracting in synchrony. Discuss what is going on and what type of cells you are looking at.

The cells in the dish are cardiomyocytes, cardiac muscle cells. They have an intrinsic ability to contract. When they link up, they form intercalculating discs that allow the cells to communicate with each other and begin contracting in sync.

As an individual ages, a constellation of symptoms begins the decline to the point where an individual's functioning is compromised. Identify and discuss two factors that have a role in factors leading to the compromised situation.

The genetic makeup and the lifestyle of each individual are factors which determine the degree of decline in cell, tissues and organs as an individual ages.

Where in the body would one find non-keratinizing stratified squamous epithelium?

The inside of the mouth, esophagus, vaginal canal and anus.

The zygote is described as totipotent because it ultimately gives rise to all the cells in your body including the highly specialized cells of your nervous system. Describe this transition, discussing the steps and processes that lead to these specialized cells.

The zygote divides into many cells. As these cells become specialized, they lose their ability to differentiate into all tissues. At first they form the three primary germ layers. Following the cells of the ectodermal germ layer, they too become more restricted in what they can form. Ultimately, some of these ectodemal cells become further restricted and differentiate in to nerve cells.

Why is it important to watch for increased redness, swelling and pain after a cut or abrasion has been cleaned and bandaged?

These symptoms indicate an infection is present.

What is a tumor?

a mass of cancer cells that continue to grow and divide

In observing epithelial cells under a microscope, the cells are arranged in a single layer and look tall and narrow, and the nucleus is located close to the basal side of the cell. The specimen is what type of epithelial tissue? a. columnar b. stratified c. squamous d. transitional

a. columnar

The process by which a less specialized cell matures into a more specialized cell is called ________. a. differentiation b. maturation c. modification d. specialization

a. differentiation

Which connective tissue specializes in storage of fat? a. tendon b. adipose tissue c. reticular tissue d. dense connective tissue

b. adipose tissue

The nerve impulse travels down a(n) ________, away from the cell body. a. dendrite b. axon c. microglia d. collagen fiber

b. axon

Connective tissue is made of which three essential components? a. cells, ground substance, and carbohydrate fibers b. cells, ground substance, and protein fibers c. collagen, ground substance, and protein fibers d. matrix, ground substance, and fluid

b. cells, ground substance, and protein fibers

Differentiated cells in a developing embryo derive from ________. a. endothelium, mesothelium, and epithelium b. ectoderm, mesoderm, and endoderm c. connective tissue, epithelial tissue, and muscle tissue d. epidermis, mesoderm, and endothelium

b. ectoderm, mesoderm, and endoderm

When a mast cell reacts to an irritation, which of the following chemicals does it release? a. collagen b. histamine c. hyaluronic acid d. meylin

b. histamine

In adults, new connective tissue cells originate from the ________. a. mesoderm b. mesenchyme c. ectoderm d. endoderm

b. mesenchyme

Which type of epithelial tissue specializes in moving particles across its surface and is found in airways and lining of the oviduct? a. transitional b. stratified columnar c. pseudostratified ciliated columnar d. stratified squamous

b. stratified columnar

Ligaments connect bones together and withstand a lot of stress. What type of connective tissue should you expect ligaments to contain? a. areolar tissue b. adipose tissue c. dense regular connective tissue d. dense irregular connective tissue

c. dense regular connective tissue

Which of the following processes is not a cardinal sign of inflammation? a. redness b. heat c. fever d. swelling

c. fever

Which of the following is the epithelial tissue that lines the interior of blood vessels? a. columnar b. pseudostratified c. simple squamous d. transitional

c. simple squamous

Which of the following central nervous system cells regulate ions, regulate the uptake and/or breakdown of some neurotransmitters, and contribute to the formation of the blood-brain barrier? a. microglia b. neuroglia c. oligodendrocytes d. astrocytes

d. astrocytes

. Under the microscope, a tissue specimen shows cells located in spaces scattered in a transparent background. This is probably ________. a. loose connective tissue b. a tendon c. bone d. hyaline cartilage

d. hyaline cartilage

Skeletal muscle is composed of very hard working cells. Which organelles do you expect to find in abundance in skeletal muscle cell? a. nuclei b. striations c. golgi bodies d. mitochondria

d. mitochondria

Which of the following lines the body cavities exposed to the external environment? a. mesothelium b. lamina propria c. mesenteries d. mucosa

d. mucosa

In bone, the main cells are ________. a. fibroblasts b. chondrocytes c. lymphocytes d. osteocytes

d. osteocytes

What are the main parts of a nerve cell?

dendrites, cell body, axon

Identify the four types of tissue in the body, and describe the major functions of each tissue

epithelial, connective, muscle and nervous. Epithelial is made up of layers of cells that cover the surfaces of the body that come into contact with the exterior world, line internal cavities and form glands. Connective tissue binds the cells and organs of the body together ad performs many functions, especially in that protection, support and integration of the body. Muscle tissue, which responds to stimulation and contracts to provide movement, is divided into 3 major types: skeletal (voluntary) muscles, smooth mucsles, and the cardiac muscle in the heart. Nervous tissue allows the body to receive signals and transmit information as electric impulses from one region of the body to another.

Why does an injury to cartilage, especially hyaline cartilage, heal much more slowly than a bone fracture?

A layer of dense irregular connective tissue covers cartilage. No blood vessels supply cartilage tissue. Injuries to cartilage heal very slowly because cells and nutrients needed for repair diffuse slowly to the injury site.

Discuss changes that occur in cells as a person ages.

All cells experience changes with aging. They become larger, and many cannot divide and regenerate. Because of alterations in cell membranes, transport of oxygen and nutrients into the cell and removal of carbon dioxide and waste products are not as efficient in the elderly. Cells lose their ability to function, or the begin to function abnormally, leading to disease and cancer.

How do somatic stem cells differ from embryonic stem cells?

Most somatic stem cells give rise to only a few cell types.

Atrophy refers to ________. a. loss of elasticity b. loss of mass c. loss of rigidity d. loss of permeability

b. loss of mass

Which of the following is not a type of tissue? a. muscle b. nervous c. embryonic d. epithelial

c. embryonic

One of the main functions of connective tissue is to integrate organs and organ systems in the body. Discuss how blood fulfills this role.

Blood is a fluid connective tissue, a variety of specialized cells that circulate in a watery fluid containing salts, nutrients, and dissolved proteins in a liquid extracellular matrix. Blood contains formed elements derived from bone marrow. Erythrocytes, or red blood cells, transport the gases oxygen and carbon dioxide. Leukocytes, white blood cells, are responsible for the defense of the organism against potentially harmful microorganisms or molecules. Platelets are cell fragments involved in blood clotting. Some cells have the ability to cross the endothelial layer that lines vessels and enter adjacent tissues. Nutrients, salts, and waste are dissolved in the liquid matirx and transported through the body.

The structure of a tissue usually is optimized for its function. Describe how the structure of the mucosa and its cells match its function of nutrient absorption.

Columnar epithelia, which form the lining of the digestive tract, can be either simple or stratified. The cells are long and narrow. The nucleus is elongated and located on the basal side of the cell. Ciliated columnar epithelium is composed of simple columnar epithelial cells that display cilia on their apical surfaces.

Which morphological adaptations of neurons make them suitable for the transmission of nerve impulse?

Neurons are well suited for the transmission of nerve impulses because short extentions, dendrites, receive impulses from other neurons, while a long tail extention, an axon, carries electrical impulses away from the cell to other neurons.

Why does skeletal muscle look striated?

Under the light microscope, cells appear striated due to the arrangement of the contractile proteins actin and myosin.

The ________ exocrine gland stores its secretion until the glandular cell ruptures, whereas the ________ gland releases its apical region and reforms. a. holocrine; apocrine b. eccrine; endocrine c. apocrine; holocrine d. eccrine; apocrine

a. holocrine; apocrine

The cells of muscles, myocytes, develop from ________. a. myoblasts b. endoderm c. fibrocytes d. chondrocytes

a. myoblasts

The cells responsible for the transmission of the nerve impulse are ________. a. neurons b. oligodendrocytes c. astrocytes d. microglia

a. neurons

Striations, cylindrical cells, and multiple nuclei are observed in ________. a. skeletal muscle only b. cardiac muscle only c. smooth muscle only d. skeletal and cardiac muscles

a. skeletal muscle only

Individuals can slow the rate of aging by modifying all of these lifestyle aspects except for ________. a. diet b. exercise c. genetic factors d. stress

c. genetic factors