animal diversity

Bio 106

What is the physiological process of hormone action?

The physiological process involves a sequence of events where hormones are released, travel to target cells, bind to receptors, and trigger specific responses.

What trait is highlighted in a phylogenetic tree?

Traits such as physical characteristics, genetic information, and evolutionary relationships are highlighted.

Define 'spongocoel'.

A spongocoel is the central cavity of a sponge that is lined with choanocytes.

What is the role of choanocytes?

Choanocytes are cells in sponges that help in filtering food particles from water.

What are nematocysts?

Nematocysts are specialized stinging structures found in cnidarians used for capturing prey.

What defines a complete gut?

A complete gut has two openings: a mouth for ingestion and an anus for waste elimination.

What are the two body forms of Cnidarians?

The two body forms are medusa and polyp.

Describe tagmatization.

Tagmatization is the evolutionary adaptation of different segments of an animal into specialized regions, or tagmata.

What is the function of water-vascular system in echinoderms?

The water-vascular system operates the tube feet for movement and feeding.

List the three major subgroups of Chordata.

The three subgroups are Cephalochordata (lancelets), Urochordata (tunicates), and Vertebrata.

How does the body utilize essential amino acids?

Essential amino acids are necessary for synthesizing proteins that the body cannot produce.

What is the primary difference in digestion methods: intracellular vs extracellular?

Intracellular digestion occurs within cells, while extracellular digestion occurs outside cells in a digestive cavity.

Describe the function of hormones in digestive enzyme release.

Hormones signal the digestive organs to secrete enzymes for breaking down food.

What is the role of the second messenger in hormone action?

A second messenger amplifies the signal from the hormone-receptor binding to elicit a response inside the cell.

What are antagonistic hormones?

Antagonistic hormones are pairs of hormones that produce opposite effects to maintain homeostasis.

Name a characteristic of steroid hormones.

Steroid hormones are lipid-soluble and typically bind to intracellular receptors.

Which types of animals exhibit a gastrovascular cavity?

Animals like cnidarians possess a gastrovascular cavity.

What process do arthropods undergo to grow?

Arthropods must molt their exoskeleton in a process called ecdysis.

What is parthenogenesis?

Parthenogenesis is a form of asexual reproduction where an egg develops into an organism without fertilization.

What are somites and their function?

Somites are segments of mesoderm that split off to form vertebrae, muscles, and dermis.

What happens during the fast block to polyspermy?

The fast block to polyspermy is a rapid electrical change in the egg membrane that prevents additional sperm from entering.

Describe the structure and function of the amniotic egg.

The amniotic egg has four membranes (amnion, chorion, yolk sac, allantois) that provide support, protection, and nutrient transfer.

What are the main differences between Type I and Type II diabetes?

Type I diabetes is an autoimmune condition with little to no insulin production, while Type II involves insulin resistance and often occurs with obesity.

What is ecdysis?

Ecdysis is the process by which an animal sheds its outer layer, such as an exoskeleton, to grow.

Explain the significance of the notochord.

The notochord provides structural support and defines the primitive body plan in embryonic development.

Describe the digestive tract's role in nutrient absorption.

The digestive tract breaks down food and absorbs nutrients through specialized structures like the small intestine.

What does positive feedback do in hormonal systems?

Positive feedback amplifies a response until a specific goal is met, such as in childbirth.

What do we mean by 'bilateral symmetry' in animals?

Bilateral symmetry refers to a body plan that is symmetrical about a central axis.

List the main components of animal diets.

Proteins, carbohydrates, fats, vitamins, and minerals are the main components of animal diets.

How is internal fertilization an adaptation to life on land?

Internal fertilization protects the fertilized egg from desiccation and increases the chance of successful reproduction in terrestrial environments.

What is the function of the mantle in mollusks?

The mantle secretes the shell and can also provide protection and sometimes functions in respiration.

Define 'organs derived from the ectoderm'.

Organs such as skin and the nervous system are derived from the ectoderm.

What is the importance of the amniotic membrane?

The amniotic membrane surrounds the embryo, providing a fluid-filled cavity that cushions the developing organism.

What are the primary roles of digestive enzymes?

Digestive enzymes break down food into smaller molecules that can be absorbed by the body.

Describe the structure of a typical sperm.

A sperm typically consists of a head (containing DNA), a midpiece (with mitochondria), and a tail (for motility).

Explain the function of the cecum in herbivores.

The cecum is involved in the fermentation of plant material to aid digestion in herbivores.

What is 'gastric juice' and its role?

Gastric juice consists of hydrochloric acid and digestive enzymes, aiding in food breakdown within the stomach.

What is the function of the pharyngeal gill arches in chordates?

Pharyngeal gill arches are involved in filter feeding in early stages and can develop into gills in fish.

How do herbivores, carnivores, and omnivores differ in tooth structure?

Herbivores have flat grinding teeth, carnivores have sharp tearing teeth, and omnivores have a mixed arrangement.

What is the significance of the visceromotor responses in animals?

Visceromotor responses help regulate internal environments in relation to external stimuli.

Describe the evolutionary significance of tube feet in echinoderms.

Tube feet evolved as a specialized adaptation for mobility and feeding in aquatic environments.

Explain the function of the gastrovascular cavity.

The gastrovascular cavity serves both as a digestive compartment and a circulatory system for certain animals.

What is a characteristic of the endoderm-derived organs?

Endoderm-derived organs include the lining of the gut and associated glands.

Describe the role of hormones in growth regulation.

Hormones signal for growth and development processes in various tissues throughout the body.

What is the function of the visceral mass in mollusks?

The visceral mass contains most of the internal organs of the mollusk.

Explain the role of the osculum in sponges.

The osculum is the opening through which water exits after passing through the sponge's body.

How do birth control pills containing synthetic progesterone prevent pregnancy?

These pills work by mimicking the hormones that regulate the menstrual cycle, preventing ovulation, thickening cervical mucus to block sperm, and thinning the uterine lining to reduce the likelihood of implantation.