What is scammon growth curve?

Scammon used tissue and organ weights at each age to characterize growth of the body into four basic curves – the general curve (physical dimensions), neural, genital, and lymphoid.

Who gave scammons growth curve?

… the 1920s, Richard Scammon 15 proposed that the different tissues and systems of the body have different growth patterns and illustrated this by plotting the percentage of the final adult size of the four main tissues from birth to 20 years ( Figure 1).

What does growth curve represent?

A growth curve is a graphical representation that shows the course of a phenomenon over time. An example of a growth curve might be a chart showing a country’s population increase over time.

What is Cephalocaudal gradient of growth?

The cephalocaudal trend, or cephalocaudal gradient of growth, refers to the pattern of changing spatial proportions over time during growth. One example of this is the gradual change in head size relative to body size during human growth.

What is meant by catch up growth?

Catch-up growth is characterized by height velocity above the limits of normal for age for at least 1 year after a transient period of growth inhibition; it can be complete or incomplete. In groups of patients, complete catch-up growth is expected to result in a mean final height close to the mean target height.

What are the two types of growth curve?

The two types of growth curves that are most common are logarithmic growth curves and exponential growth curves.

Why is growth cephalocaudal?

Cephalocaudal development describes the general growth pattern of organisms to develop areas near the main neural area (typically the head) earlier than areas of the body that are more distant. So, cephalocaudal development can mean head-body development in which the head develops first.

What is Proximodistal rule?

Proximodistal development describes the general tendency for the development of motor skills to start at the center of an organism and radiate outwards from there. The middle is the first to develop and movement extends outwards from there. Infants will first learn to move their torso and then their arms and legs.

What causes catch up growth?

The factors responsible for catch-up growth and the regulating mechanisms are unknown. Serum growth factors, receptor changes or genetically programmed cells are more likely to be involved than the classical growth promoting hormones. Superficially catch-up growth is a growth spurt similar to the pubertal growth spurt.

What is most characteristic of catch up growth?

Catch-up growth is characterized by height velocity above the limits of normal for age for at least 1 year after a transient period of growth inhibition; it can be complete or incomplete.

What are the four types of growth?

The four growth strategies

• Market penetration. The aim of this strategy is to increase sales of existing products or services on existing markets, and thus to increase your market share.
• Market development.
• Product development.
• Diversification.

How to find out the effect of compost on plant growth?

For example, suppose a student wants to find out the effect of compost on plant growth. S/he conducts an experi- ment in which half the plants are grown in compost and the other half in soil. Reasoning that compost has a higher nutrient content than soil, s/he corrects for this by fertilizing only the plants grown in soil.

Which is the first phase of Scammon’s growth?

Scammon’s growth curves and the four phases of growth. Phase 1: At the same time of the rapid growth in the brain and nervous system, there is also rapid physical development in the first few years of life before it begins to slow into steady growth during mid-to-late childhood ( Phase 2).

What should the C to N ratio be for composting?

Bacteria, whose biomass is over 50% protein, need plenty of nitrogen for rapid growth. The ideal carbon-to-nitrogen (C:N) ratio for composting is generally considered to be around 30:1, or 30 parts carbon for each part nitrogen by weight.

What kind of experiments can you do with compost?

Research Possibility:Water in which compost has been soaked (often called compost tea) is said to be beneficial to plants. Can you design experiments to test whether different types, concentrations, and amounts of compost tea enhance plant growth? The instructions below outline a protocol for conducting plant growth experiments in the laboratory.