Human Body Systems Flashcards
What are the main types of tissue?
Connective tissue
Epithelial tissue
Muscle tissue
Neural tissue
What are connective tissue?
Bonds cell and organs
Protects support and integration
What are epithelial tissue?
Covers exterior, lines internal cavities and some glands
What are muscle tissue?
Excitable contracts: skeletal, smooth, cardiac
What are neural tissue?
Excitable : allows propagation of nerve impulses that communicate between different parts of the body
What are the two types of tissue support?
Extracellular matrix
Cellular junctions
What is the extra cellular matrix?
Material synthesised and secreted by the cells of a tissue
Very abundant in connective tissue
What are cellular junctions?
Hold cells together
Cell adhesion molecules (CAM’s)
What are the use of the epithelia?
Protect/regulate exchange
How do epithelia allow exchange?
Simple, thin flattened cells, gaps /pores
Rapid gas exchange
Blood vessels
How do epithelia support transporting?
Simple, cuboidal or columnar
Actively regulate
What are the properties of epithelia?
Ciliated - sweeps fluid across surface
Protective- prevent exchange
Secretory- glands
What are the three types of connective tissue?
True connective
Supportive connective
Fluid connective
What are the two types of true connective tissue?
Loose- adipose and reticular
Dense- regular and irregular
What are the two types of supportive connective tissue?
Cartilage
Bones
What are the two types of fluid connective tissue?
Blood
Lymph
What is the meaning of homeostasis?
Physiologically, keeping the body’s environment in a state of equilibrium within ‘normal limits’
What is the meaning of negative feedback?
Negative feedback brings a system back to its level of normal functioning
How does the negative feedback loop work?
Regulated variables maintained within their acceptable range by physiological control mechanisms
How does the regulation of homeostasis work?
Oscillations around a set point
Detectors have a threshold
What is the meaning of positive feedback loop?
Enhances or accelerates output created by an activated stimulus
How does positive feed back loop work?
Reinforces a change in a controlled condition
Continues until interupted
What is the meaning of afferent?
Towards the centre
What is the meaning of efferent?
Away from the centre
What is the integration centre?
Brain