Biology sem 2 wk 6

Which is part of the repair process to heal a broken bone?

• A blood clot temporarily keeps blood from the bone

• Endorphins cause inflammation to hasten cell division.

• Osteoclasts remove dead bone cells to clean the site

Which explains why a person’s skin becomes darker when frequently exposed to sunlight?

• Cells in the dermis layer become thicker and layered.

• Epithelial cells in the epidermis stretch to protect tissues.

• Exposure to sunlight causes melanin to be produced.

• Sebaceous glands secrete additional oil for protection.

Which is part of the appendicular skeleton?

• clavicle

• skull

• sternum

• vertebra

Which would cause fatigue in the body of a long-distance runner?

• metabolizing oxygen aerobically

• decrease of fermentation energy

• buildup of lactic acid in muscle

• excess ATP created in muscle cells

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

The basic unit of a muscle that causes contraction is called a sarcomere. 

• true

• false

Which would be the effect of a malfunctioning neurotransmitter?

• A nerve impulse would be stopped in the brain.

• A nerve impulse would be stopped in the spinal column.

• An impulse could not cross the gap between neurons.

• An impulse could not move along the axon of a neuron.

Which directly controls a person’s decision to use the bicep muscles to lift a barbell?

• autonomic nervous system

• central nervous system

• parasympathetic nervous system

• somatic nervous system

Which is caused by the sympathetic nervous system?

• contracted bronchial muscle

• dilated pupil

• increased intestinal secretions

• slowed heart rate

The spinal column is part of a major division of the nervous system called the __ nervous system.

• somatic

• central

• autonomic

• peripheral

A bundle of axons is called a(n) __.

• nerve

• column

• phalange

• dendrite