Biology Lecture Notes on Gymnosperms and Animal Body Organization

A series of flashcards covering key concepts and terms related to gymnosperms and the organization of animal bodies as discussed in the lecture.

Gymnosperms

Plants with 'naked seeds' where the ovule is not fully enclosed.

Cycads (Cycadophyta)

Sporophytes that resemble palm trees; dioecious, producing either pollen-bearing or ovule-bearing cones.

Gnetophytes (Gnetophyta)

A group of about 65 species characterized by the presence of vessels in their xylem, as well as dioecious morphologically diverse plants.

Ginkgophytes (Gingkophyta)

Only one living species remains, Ginkgo biloba, which is resistant to pollution.

Epithelial Tissue

Tissue that covers every surface of the body, forming a protective barrier with tightly bound cells.

Connective Tissue

Tissue arising from mesoderm, consisting of abundant extracellular material called the matrix.

Muscle Tissue

Specialized tissue that carries out work in animals, comprising smooth, skeletal, and cardiac muscles.

Nerve Tissue

Consists of neurons and supporting cells (neuroglia), enabling communication in the body.

Simple Epithelia

Single layer of epithelial cells, including simple squamous, cuboidal, and columnar epithelia.

Stratified Epithelia

Multiple layers of epithelial cells that provide increased protection, such as stratified squamous epithelium.

Exocrine glands

Glands that secrete products via ducts, such as sweat and salivary glands.

Endocrine glands

Glands that release hormones directly into the bloodstream.

Dense Connective Tissue

Connective tissue with less ground substance than loose connective tissue, forming tendons and ligaments.

Cartilage

Firm and flexible connective tissue found on joint surfaces and in structures such as the nose and ears.

Bone

A special connective tissue that is hardened with mineralized calcium phosphate, housing osteocytes in lacunae.

Blood

A fluid connective tissue with cells suspended in fluid plasma, including erythrocytes and leukocytes.

Organ Systems

Groups of organs that work together to perform major activities of the body, such as digestive and respiratory systems.

Dioecious

Describing plants that have distinct male and female individual organisms.

Pseudostratified Epithelia

Epithelial tissue that appears stratified but is actually a single layer, often found in the respiratory tract.

Mitosis

The process of cell division that results in two genetically identical daughter cells.

Matrix

The abundant extracellular material that fills the spaces between cells in connective tissue.

Neuroglia

Supporting cells in the nervous system that do not conduct electrical impulses.

Skeletal Muscle

Striated muscle tissue under voluntary control responsible for powering movements.

Cardiac Muscle

Striated muscle found in the heart that is involuntary and interconnected at intercalated disks.