Human Reproduction
What part of the male reproductive system makes the sperm?
Testes/Testis
Define homeostasis.
Balanced internal environment.
What method does a potato use for reproduction?
Tuber
What makes up the CNS
Brain and spinal cord.
How many parents are involved in asexual reproduction?
1
What is a zygote?
The first cell of a new organism created by the fusion of a sperm and an egg.
Which hormones are secreted by the pancreas?
Glucagon and insulin
The stigma, style and ovule make up the _________ of a flower.
pistil
What part of the PNS manages voluntary movements and sensory information, allowing control over skeletal muscles?
Somatic nervous system.
What are 2 benefits of asexual reproduction?
Fast and no need to find a mate.
Contrast internal and external fertilisation.
Sperm enters egg outside of the body vs sperm enters egg within the body.
What part of the brain is considered to be the control centre?
Hypothalamus
Identify the 2 parts that make up the stamen part of a flower.
Filament and anther.
The scientific name of a nerve cell is a:
Neuron
What is a disadvantage of asexual reproduction?
Lack of genetic variation can be dangerous for a species - e.g. wiped out by a disease.
In what part of the body does the growing foetus develop?
Uterus
Describe how a reflex works.
Receptor detects the stimulus and sends a message up a sensory neuron to the spinal cord, which then sends an impulse down a motor neuron to an effector (e.g. muscle). The brain is not involved but finds out later!
Describe the purpose of petals on a flower.
Attract pollinators, such as bees, birds and insects.
Describe the function of the myelin sheath.
The myelin sheath insulates axons to allow for faster transmission of nerve impulses
Describe the method of fragmentation and list one type of organism which can reproduce using this method.
Organisms break into two or more fragments, each of which grows into a complete organism over time. E.g. flatworms, sea stars
Describe what is meant by the gestation period.
The process or period of developing inside the uterus between conception and birth.
Describe what is meant by a negative feedback system.
Negative feedback systems are control mechanisms that maintain stability (homeostasis) by reversing or reducing changes in a variable, such as temperature, hormone levels, or chemical concentrations
What is meant my seed dispersal and propose 2 ways in which seeds are dispersed.
Spreading of seeds - either by exploding seed pods, attaching to other organisms, being eaten and excreted as waste, floating in the wind or water.
Describe how a neuron passes on a message to another nerve cell.
Neurons pass messages to other nerve cells by action potentials and involves neurotransmitters released across the synapse and these bind with receptors on the receiving neuron.
Describe how the number of offspring produced by animals is related to the amount of parental care
More offspring = less care.
Less offspring = more care.