Human Biology Unit 3 questions with
verified answers.
What is collected by the nervous system? ANS - sensory information from receptors in contact with the
internal and external environment
What do motor responses lead to ANS - muscular contractions or glandular secretions
what is the nervous system made up of ANS - central nervous system and peripheral nervous system
what do sensory pathways do ANS - carry nerve impulses from receptors to the CNS and keep the brain
in touch with what is going in in the internal and external environment
what do motor pathways do ANS - carry nerve impulses from the CNs to the effectors and the
appropriate response is then carried out
what does the brain do with the information from the sensory pathways ANS - analyses , interprets ,
processes and stores the information and pass it onto motor pathways
what are the branches of the peripheral nervous system ANS - somatic nervous system and autonomic
nervous system
what is the somatic nervous system ANS - spinal nerves and controls the skeletal muscles, controls
some reflex actions but mostly voluntary actions
What is the autonomic nervous system composed of ANS - sympathetic and parasympathetic system
Describe the autonomic nervous system ANS - regulates the internal environment by controlling organs
such as the heart, bronchioles and blood vessels and is involuntary and is made up of the antagonistic
sympathetic and parasympathetic systems
, What is meant by the harmonious balance of the autonomic nervous control ANS - the sympathetic and
parasympathetic systems are constantly working at an equal rate but having opposite effects
What effect does the autonomic system have on the heart ANS - parasympathetic nerves decreases the
rate and force of contractions decreasing the cardiac output of blood whereas the sympathetic does the
opposite increasing the rate
what does the sympathetic nervous system do ANS - when stimulated the sympathetic system
prepares the body for action by fight or flight, heart rate increases and blood diverted to skeletal
muscles as a result of an increased amount of epinephrine in the blood
what does the parasympathetic nervous system do ANS - calms the body down for rest and digest
dropping heart rate to normal which conserves resources and stores energy
what is the brain made up of ANS - central core , limbic system and cerebral cortex
what is the central core ANS - contins the medulla and cerebellum, the medulla controlls breathing and
heart rate whereas the cerebellum controls balance and coordination
what is the limbic system ANS - found deep in the cerebral cortex and is responsible for processing
information for long term memory , regulating emotional states and influencing biological motivation
what does the pituitary gland do ANS - releases hormones such as the growth hormone which is
essential for growth and development of body , thyroid stimulating hormone which promotes thyroid to
produve thyroxin and gonatrohic hormones which are released to stimulate the production and release
of gametes
How does the hypothalmus control the contraction of smooth muscle ANS - axons of neurons in
hypothamus extend into the sympathetic and parasympathetic centres allowing hypothalmus to
regulate autonomic activities such as contraction and relaxation of smooth muscle involved in
homeostatic mechanisms
How does the hypothalmus control body temperature ANS - containd thermorecepptors that are
sensitive to changes in blood temperature which changes body temperature, nerve impulses are then
verified answers.
What is collected by the nervous system? ANS - sensory information from receptors in contact with the
internal and external environment
What do motor responses lead to ANS - muscular contractions or glandular secretions
what is the nervous system made up of ANS - central nervous system and peripheral nervous system
what do sensory pathways do ANS - carry nerve impulses from receptors to the CNS and keep the brain
in touch with what is going in in the internal and external environment
what do motor pathways do ANS - carry nerve impulses from the CNs to the effectors and the
appropriate response is then carried out
what does the brain do with the information from the sensory pathways ANS - analyses , interprets ,
processes and stores the information and pass it onto motor pathways
what are the branches of the peripheral nervous system ANS - somatic nervous system and autonomic
nervous system
what is the somatic nervous system ANS - spinal nerves and controls the skeletal muscles, controls
some reflex actions but mostly voluntary actions
What is the autonomic nervous system composed of ANS - sympathetic and parasympathetic system
Describe the autonomic nervous system ANS - regulates the internal environment by controlling organs
such as the heart, bronchioles and blood vessels and is involuntary and is made up of the antagonistic
sympathetic and parasympathetic systems
, What is meant by the harmonious balance of the autonomic nervous control ANS - the sympathetic and
parasympathetic systems are constantly working at an equal rate but having opposite effects
What effect does the autonomic system have on the heart ANS - parasympathetic nerves decreases the
rate and force of contractions decreasing the cardiac output of blood whereas the sympathetic does the
opposite increasing the rate
what does the sympathetic nervous system do ANS - when stimulated the sympathetic system
prepares the body for action by fight or flight, heart rate increases and blood diverted to skeletal
muscles as a result of an increased amount of epinephrine in the blood
what does the parasympathetic nervous system do ANS - calms the body down for rest and digest
dropping heart rate to normal which conserves resources and stores energy
what is the brain made up of ANS - central core , limbic system and cerebral cortex
what is the central core ANS - contins the medulla and cerebellum, the medulla controlls breathing and
heart rate whereas the cerebellum controls balance and coordination
what is the limbic system ANS - found deep in the cerebral cortex and is responsible for processing
information for long term memory , regulating emotional states and influencing biological motivation
what does the pituitary gland do ANS - releases hormones such as the growth hormone which is
essential for growth and development of body , thyroid stimulating hormone which promotes thyroid to
produve thyroxin and gonatrohic hormones which are released to stimulate the production and release
of gametes
How does the hypothalmus control the contraction of smooth muscle ANS - axons of neurons in
hypothamus extend into the sympathetic and parasympathetic centres allowing hypothalmus to
regulate autonomic activities such as contraction and relaxation of smooth muscle involved in
homeostatic mechanisms
How does the hypothalmus control body temperature ANS - containd thermorecepptors that are
sensitive to changes in blood temperature which changes body temperature, nerve impulses are then
