Answer:
Autonomic regulation of heart is via two reflex centers that are found in medulla oblongata
Explanation:
Medulla oblongata contain long stem that makes the upper part of brain case and this is a cone shaped structure which is responsible for autonomic regulation like controlling heart rate,vomiting,respiration,breathing etc.
The heart rate is controlled by autonomic nervous system that are mainly sympathetic and parasympathetic nervous system that releases hormones like catecholamine (epinephrine and non epinephrine) which helps in controlling the heart rate.
Medulla oblongata mainly connects the brain with the spinal cord that are responsible for responsible for the autonomic functions which contain -
Controlling the ventilation via signalling system regulated by chemo receptors which detects change in acidity of the blood.
Acts on cardiovascular centers.
Controlling the reflex centers like vomiting,coughing,sneezing,swallowing etc.
Answer:
They travelled over 2000 miles by sea is exceptional about the role of early Polynesian cultures in exploration
Explanation:
These people have the exceptional talent having the excellency in boat making. And have the ability to sail across the sea with the help of currents, stars and with cloud formation. They have excellency with the highest skill in fishing and farming. Growing of fruit trees, growing of vegetables that also includes the growing of pigs, poultry and dogs. Islanders were having the talent of craftspeople, and cravings of wood, fibre and feathers for creating pieces of power and beauty.
Scientists often perform experiments to check and recheck their work. They also redo these experiments to ensure correct results.
Answer:
A. supplementary motor cortex; premotor cortex
Explanation:
The supplementary motor cortex, also known as the supplementary motor area (SMA), is an area of the cerebral cortex located anterior to the premotor cortex. This area (SMA) is involved in the execution of complex and rapid sequential movements (e.g., typing). Moreover, the premotor cortex is an area of the motor cortex located between the primary motor cortex and the prefrontal cortex. This area (premotor cortex) is activated during motor tasks including, among others, spatial and sensory guidance of movement.
